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Two of a Kind Diaries
Series · 38
books · 1875-2005

Books in series

It's a Twin Thing book cover
#1

It's a Twin Thing

1999

Baby-sitter BluesAshley can't wait to go back to school. The new school year means shopping for new clothes, meeting boys...shopping for more new clothes! Her twin sister, Mary-Kate, thinks she's crazy. Mary-Kate would much rather hit a softball than hit the mega-mall. But they do agree on one thing: They're way too old for a baby-sitter! Too bad their dad doesn't see it the same way. Now the twins need a plan—a plan to show Dad just how right they are! Look inside for our photo scrapbook from the show!
How to Flunk Your First Date book cover
#2

How to Flunk Your First Date

1999

Love x 2 = Trouble Ashley is so jealous. Mary-Kate has a new math tutor—and he's totally cute! The problem is, Mary-Kate couldn't care less about cute. Her math lessons are making her miss basketball practice—and that means she won't be able to play in the big game! So the twins decide to switch places. Now Ashley is working on fractions with the tutor, while Mary-Kate is working on her jump shot. But can they fool everyone long enough to get what they want? Look inside for our photo scrapbook from the show!
The Sleepover Secret book cover
#3

The Sleepover Secret

1999

Surprise! What a blast! Ashley is having a sleepover—and Jennifer Dilber, the most popular girl in school, is coming! Ashley works super-hard to make sure her party will be perfect. She doesn't want any surprises. But she gets a big surprise when the girls play Truth or Dare—and Mary-Kate tells Jennifer an amazing secret. A secret she's never even told Ashley... Look inside for our photo scrapbook from the show!
One Twin Too Many book cover
#4

One Twin Too Many

1999

My Pokey Valentine Oh no! Mary-Kate and Ashley have to do history projects. But Ashley's found a way to make her project fun—she's partners with Pokey Valentine, the boy of her dreams! It's the perfect way to get close to him. The only problem is, Pokey would rather get close to someone else...someone named Mary-Kate!
To Snoop or Not to Snoop book cover
#5

To Snoop or Not to Snoop

1999

Mary-Kate and Ashley have a new telescope. Their father bought it so they could learn about the stars. The twins have a better idea, though: They're going to spy on their neighbors But the spying turns serious when Mary-Kate sees something she shouldn't. Something that spells big trouble for the twins...
My Sister the Supermodel book cover
#6

My Sister the Supermodel

1875

Book by Mary-Kate Olsen
Let's Party book cover
#8

Let's Party

1999

Ashley has a great idea! She's going to give a surprise party for her friend Jennifer. But Ashley gets a surprise, too—when she finds out that Mary-Kate is giving another party for her best friend Amanda on the same night! But the biggest shocker of all is the one Dad has for both of the girls—one that's going to change their lives big-time!
Winner Take All book cover
#10

Winner Take All

2000

Dear Diary, Today was the worst day of my life. I tried out for the White Oak softball team, and it was a total disaster. I couldn't do anything right. I never even made it to the first base. I missed a fly ball. And I struck out—six times in a row! But that's not the worst thing. Ashley is the new gossip columnist for the school paper—and she wrote something about me. Something I didn't want anyone else to know!
P.S. Wish You Were Here book cover
#11

P.S. Wish You Were Here

2000

Book by 'MARY-KATE OLSEN, ASHLEY OLSEN'
The Cool Club book cover
#12

The Cool Club

2000

Too Cool for School? There's a new girl, Elise, at White Oak Academy—and Mary-Kate and Ashley think she's the coolest. That's why when she forms a new super-secret club and asks Mary-Kate and Ashley to join, they say yes. They're thrilled—until things start to go really wrong. None of Mary-Kate and Ashley's other friends are invited to join the club! And then Mary-Kate and Ashley find out that the kids in the club have a huge secret—one that could get them into very big trouble!
War of the Wardrobes book cover
#13

War of the Wardrobes

2000

Ashley can't believe it. White Oak Academy is going to require the students to wear uniforms—and its all her fault! Ashley wrote an article about dress codes for the school newspaper, and everyone is talking about it. her sister, Mary-Kate, doesn't think uniforms are such a bad idea. In fact, they'd make life a whole lot simpler. But she knows Ashley dreads a fashionless future. Now, Mary-Kate and Ashley have to devise a brilliant plan to ban the uniforms—and fast!
Bye-bye Boyfriend book cover
#14

Bye-bye Boyfriend

2000

To Kiss or Not to Kiss... Mary-Kate has a great new hobby—acting She's got the starring role in the next school play. And she's thrilled to find out that her leading man will be Ross Lambert—a supersweet guy who just happens to be Ashley's big-time crush Ashley is excited for her sister—until she finds out that Mary-Kate has to kiss Ross onstage There's no way that's going to happen. Not if Ashley can help it
It's Snow Problem book cover
#15

It's Snow Problem

2001

Hans Jensen is tall, blond, and gorgeous—and thinks he's the best at everything. When he signs up for every ski race in the White Oak/Harrington Winter Festival, Mary-Kate does too. Hans isn't the only super-athlete around—and she's going to prove it! But then Mary-Kate gets into major trouble—and is thrown off all the teams! Can Ashley help her sister get back on—or is Mary-Kate out of the race for good?
Likes Me, Likes Me Not book cover
#16

Likes Me, Likes Me Not

2001

The annual Spring Fling's coming up and Mary-Kate and Ashley have hot dates for the dance. At least they think they do—until they find out their dates have asked other girls instead. To make matters worse, Mary-Kate's crush is going out with her best friend! Should Mary-Kate and Ashley just go ahead and get new dates for the dance? Or should they get...revenge?
Shore Thing book cover
#17

Shore Thing

2001

Dear Diary, I'm on a beach in Florida—and I'm in trouble! When Ashley and I got here for our school trip, I thought everything would be great. What could be better than sun, sand, and cool guys with tans? I couldn't scuba dive—until I read this scary book about barracudas and jellyfish and sharks. And I started freaking out! Aschley was too busy juggling Two boyfriends to even notice how scared I was. Finally, I pulled myself together and got rid of the book. But now I wish I had it back—because something really horrible has happened and I don't know what to do! — Mary-Kate
Two for the Road book cover
#18

Two for the Road

2001

Dear Diary, So far this school trip to sunny Florida has been a blast. I've even been made captain of our triathalon sports team! But now Dana Woletsky has shown up and she wants to take the team away from me. She wants to take my boyfriend, Ross, away, too! How can I keep her from ruining my summer? I wish Mary-Kate could help, but she can't. She's spending all her time frantically looking for her lost diary. She says there's something in it no one should read, but she won't tell me what it is. I mean, what could be so bad? — Ashley
Surprise, Surprise! book cover
#19

Surprise, Surprise!

2001

The good news is—Mary-Kate made the White Oak winter sports team! The bad news is—she has no money to buy her own snowboard. She asks Ashley to help her, but Ashley has problems of her own. She's trying to win a dream job at a hot new fashion magazine. Should they break the rules to get what they want?
Sealed with a Kiss book cover
#20

Sealed with a Kiss

2001

Mary-Kate and Ashley can't wait to go home for winter break. But they wind up stuck in a Harrington dorm instead. To make matters worse, the headmaster thinks that doing endless chores is more fun than singing carols and decking the halls! But things start to look up when the girls meet a new boy with a romantic holiday secret....
Now You See Him, Now You Don't book cover
#21

Now You See Him, Now You Don't

2002

Mary-Kate and Ashley have great tricks ready for the Harrington magic show. They're sure to be a hit! But before show time, Ashley's partner leaves her trapped in a box and Mary-Kate's mind-reading horse disappears. The girls are going to need some real magic to get out of this one!
April Fools' Rules book cover
#22

April Fools' Rules

2002

The freshmen at White Oak, led by Mary-Kate and Ashley, are out to one-up each other with silly pranks. But when the joke goes too far, the girls need to pull off the best April Fools' Day ever
Island Girls book cover
#23

Island Girls

2002

Dear Diary, Did you know that if you upset the fire goddess of Hawaii, you'll have bad luck forever? I didn't—until I upset her big-time! Now I have the worst luck ever. There's only one thing left to do—figure out how to make an angry goddess happy! Ashley promised to help me out, but she can't. She threw a big party at our hotel—and now she's in big trouble! — Mary-Kate
Surf, Sand, and Secrets book cover
#24

Surf, Sand, and Secrets

2002

Ashley and I were on a ski vacation, and we couldn't wait to hit the slopes—until we heard the scary legend of Ski Mountain. According to the story, a monster snatched a boy right off the ski slopes The boy was never seen again.But it was just a story. Or that's what we thought. Until our ski lift stopped mysterious in midair... And the tree outside our cabin was ripped apart... And we found giant footprints in the snow. We were on the case. Was there really a Ski Mountain monster? We were about to find out—one way or another
Closer Than Ever book cover
#25

Closer Than Ever

2002

Together Again! Mary-Kate and Ashley have never been roommates at White Oak—until now! Mary-Kate can't wait to share a dorm room with her sister. But when Ashley moves in, she takes over the closet, turns out the lights by eight o'clock, and keeps her giant stuffed giraffe in Mary-Kate's bed! Mary-Kate's friends say she won't last one week in the same room with Ashley. But Mary-Kate has a surefire plan to turn her sister into the perfect roommate!
The Perfect Gift book cover
#26

The Perfect Gift

2002

Mary-Kate gets a beautiful beaded necklace from her Secret Santa. She thinks it's from Carter, a really cute boy in one of her classes. Could Carter have a crush on her? Ashley gets the worst presents ever from her Secret Santa—stinky gym socks and a half-eaten sandwich! Her Secret Santa must really not like her. And Ashley has the feeling it's one of her friends!
The Facts About Flirting book cover
#27

The Facts About Flirting

2003

Mary-Kate has a crush on a boy named Jordan. A huge crush. But she's too shy to tell him how she feels. So Ashley starts writing love letters for Mary-Kate and sends them to Jordan. She is thrilled when Jordan writes back to Mary-Kate. His letters are so sweet and funny and romantic ... Uh-oh. Ashley can't help it, but she's falling for Jordan, too—big-time!
The Dream Date Debate book cover
#28

The Dream Date Debate

2003

Everyone at White Oak is buzzing over a hot new game called the Dream Date Debate. Couples have to answer questions about each other and Ashley is sure she'll win. She knows everything about her boyfriend Ross...except the deep dark secret she finds out he's been hiding from her! Mary-Kate has a secret, too. She knows that one of the couples in the game is cheating—and she plans to teach them a lesson they'll never forget!
Love-Set-Match book cover
#29

Love-Set-Match

2004

Dear Diary, I decided to join the big tennis tournament at camp. My doubles partner, Andrew, is really cute! The coach says we can't date, but Andrew says we should break the rules. Hmmm. I guess we'll just have to make sure we don't get caught! — Ashley Dear Diary, Well, it's official. I can tie three kinds of knots and climb a tree in under three minutes. How is this useful, you ask? It's all apart of a contest our camp is having with the rival camp down the road, and I want to win! But someone is standing in the way of our victory. My very own sister! — Mary-Kate
Making a Splash book cover
#30

Making a Splash

2003

Dear Diary, All I wanted was to fit in with the cool kids at camp. How was I supposed to know that one tiny dare would get me into such a big mess? — Ashley Dear Diary, The Top Three Reasons I Should Not Be Teaching Arts and Crafts to Six-Year-Olds
Dare to Scare book cover
#31

Dare to Scare

2003

Dear Diary, Ashley is so lucky. She's "in" with the older girls! They say I can be part of the group, too ... but you'll never believe what they want me to do first! — Mary-Kate Dear Diary, Awesome news! the coolest girls in the entire school want me to hang with them and help put together their Halloween party this year! Here's the not-so-awesome Mean Dana Woletsky thinks only she should be friends with the cool girls. And she'll do whatever it takes to keep me out of their group! — Ashley
Santa Girls book cover
#32

Santa Girls

2003

Ho-ho-how are Mary-Kate and Ashley supposed to earn enough money to buy everyone Christmas presents this year? By working as Santa's Helpers at the mall! The girls think it will be tons of fun. But five children crying, four parents yelling, three missing paychecks, two stolen presents and one big accident at work leave Mary-Kate and Ashley needing a Christmas miracle to get through the season this year!
Heart to Heart book cover
#33

Heart to Heart

2004

It's Mary-Kate's first Valentine's Day with a boyfriend and she is filled with Valentine's Day spirit. So much so that she decides to put an ad in the school paper and advertise herself as a singing telegram for White Oak and Harrington! She's having a great time sending Valentine's messages for her friends . . . until she gets a request to give a Valentine to her own boyfriend—from someone else! Ashley isn't thinking about Valentine's Day. She got a bad grade on a science test and the only way she'll get an A on the next one is if she can convince the biggest nerd in the class to tutor her. He says he'll do it—but only on one condition. Ashley has to turn him into a total stud in time for Valentine's Day so the girl of his dreams will go out with him. The problem? Nothing Ashley does seems to change him at all! And if she doesn't change him soon, she'll be out of luck for her next test!
Prom Princess book cover
#34

Prom Princess

2004

Book by Olsen, Ashley
Camp Rock 'n' Roll book cover
#35

Camp Rock 'n' Roll

2004

Dear Diary, This totally hip girl, Erin, just joined our band at camp. She is so cool, and we really hit it off. But Erin and my best friend, Phoebe, HATE each other. What a rock n' roll mess—Ashley Dear Diary, One the girls in my band, Lark, has a big secret. And I know what it is—Lark's dad is actually a huge rock n' roll star. So what is Lark doing here? I wonder. She doesn't need this camp to learn about music. Maybe Lark has another secret ... — Mary-Kate
Twist and Shout book cover
#36

Twist and Shout

2004

It's like a dream come true! This week's Mystery Guest at Camp Rock n' Roll is Ashley's all-time favorite group, 4You! 4You will be choosing campers to mentor for the end-of-the-summer showcase. Ashley wants to be chosen—but so does Madison, the lead singer in the rival band. Can Ashley find a way to sing with the most popular group in the world? Mary-Kate loves jamming with her band—they've all become great friends, and her new boyfriend is even part of the group. Then a record industry executive stops by camp and tells Mary-Kate that she has real talent—but her band is not as good as she is. He tells her to find a new band before he comes back for the showcase and he can make her a star. Will Mary-Kate dump her friends for the promise of fame?
Hocus-Pocus book cover
#37

Hocus-Pocus

2004

Mary-Kate meets a cool, teenage fortune teller who tells Mary-Kate' s fortune. While all the predictions come true, every choice Mary-Kate makes based on the fortune-teller' s predictions seems to destroy her friendships. Ashley tries to convince Mary-Kate to make decisions on her own-and while she' s at it, she discovers she has the power to foresee trouble too-this time for the phony fortune teller
Holiday Magic book cover
#38

Holiday Magic

2004

It's the White Oak Holiday Food Festival, and Mary-Kate and Ashley are creating their own restaurant called Sugar and Spice as part of a school competition. But when the important alumni arrive for dinner, Ashley still can't remember grandma's secret ingredient for the main course, Mary-Kate is overrun with chickens, and the pine cone garlands are dripping into the soup. Help!
Candles, Cake, Celebrate! book cover
#39

Candles, Cake, Celebrate!

2005

When Mary-Kate wins praise for scoring high on her state tests, Ashley decides to throw a surprise party for her. But Mary-Kate is notoriously impossible to surprise! What if Ashley could get Mary-Kate to plan the party with her by pretending that the festivities were for their friend Lavendar's birthday? Well, if you're Mary-Kate, the party would end up being soooo Lavendar and soooo not Mary-Kate. Can Ashley change everything around in time to really suprise Mary-Kate, or will Mary-Kate figure things out as usual?
Wish on a Star book cover
#40

Wish on a Star

2005

It's Animal Week at school in this Mary-Kate and Ashley story, perfect for younger fans. Join Mary-Kate as she starts working at Starbright Stables - her dream job But she's not with her perfect partner... It's "Animal Week" in Mary-Kate's Social Sciences class. Mary-Kate is assigned to Starbright Stables. She loves horses - what a perfect fit But Mary-Kate's partner, Courtney, hardly ever shows up when she's supposed to. Mary-Kate is stuck doing all the work herself and the girls are being graded as a team. Can Mary-Kate get Courtney to help, or will they both fail the assignment? Find out in this sassy story, especially for younger Mary-Kate and Ashley fans

Authors

Diana G. Gallagher
Diana G. Gallagher
Author · 53 books

Diana G. Gallagher was an American author who wrote books for children and young adults. She also wrote the space opera The Alien Dark (1990), but was best known for her tie-in work for television properties including Buffy the Vampire Slayer, Angel, Sabrina the Teenage Witch, Charmed, Star Trek and The Secret World of Alex Mack, among others. She was also a prolific filk creator, winning Pegasus Awards in 1986 and ’94. Gallagher won a Hugo Award for Best Fan Artist in 1988 under the name Diana Gallagher Wu. She sometimes also wrote under the name Diana Burke. Born in 1946, in Paterson, New Jersey, she lived in Florida with her husband, the writer Martin R. Burke, who predeceased her in 2011. Gallagher was married four times; her third marriage was to author William F. Wu (divorced 1990). Gallagher died December 2, 2021 of chronic obstructive pulmonary disease at 75 years of age.

Megan Stine
Author · 58 books

Megan Stine is the Editor-in-Chief of Real U Guides and the author of more than 100 books for young readers including Trauma-Rama, an etiquette book for teenagers published by Seventeen magazine, and several titles in a series based on the popular 1990’s television series Party of Five. A frequent writer of books in the enormously popular Mary-Kate and Ashley series, she is the best-selling author of Likes Me, Likes Me Not and Instant Boyfriend. She has worked with CBS and ABC in developing comedy and drama television pilots, and has written comedy material for a well-known radio personality in New York. When she isn’t writing, she is a portrait and fine art photographer and a contributing photographer for the Real U series of guides.

Nancy Butcher
Author · 13 books
Nancy Butcher has written on health and wellness subjects for WholeHealthMD.com and other websites as well as creating wellness booklets for Time-Life Books. She is the author of the New York Times bestselling children's book It's Snow Problem, and 101 Ways to Stop Eating After Dinner.
Cathy East Dubowski
Cathy East Dubowski
Author · 31 books
Cathy East Dubowski is a narrator, editor, and illustrator. She specializes in novelizations of movies and literary classics for children and young adult readers. Dubowski has written more than 100 books for children, including adaptations of The Aristocats, Frances Hodgson Burnett’s A Little Princess, and Anna Sewell’s Black Beauty.
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