Cookie's life is basically over. Her best friend in the whole world is moving to Solihull because one of her dads has a new job there. Solihull?! Where even is that?! Cookie begs her parents for a pet to fill the void but they have given her an absolute NO. It would be way too expensive and way way too messy. But Cookie has never been a fan of the word 'no' so she visits the pet shop anyway and sets her heart on the sweetest cutest kitteniest kitten ever: Bluey. But then . . . DISASTER! The most ANNOYING boy she's ever met in her entire nine years goes into the pet shop, buys Bluey and renames her Nigel! And then he joins her year at school! And if that wasn't bad enough, he moves in next door to her. AAAAGGGGHHHHH! But it's not all bad . . . Cookie gets the chance to go on her favourite TV show, Brainbusters. It's only a chance though - she'll have to win the school science competition first. It shouldn't be too hard . . . all she has to do is keep her head down, and not get too over-excited. Unfortunately that's not Cookie's strong point.

Cookie, Keziah and Jake are best mates and life is good. Cookie's birthday party is coming up and she has had the most fantastic idea for a Save the Planet party where everything is recyclable and no plastic is used. Before long, Cookie is buzzing with plans. But then disaster strikes - Suzie Ashby totally swipes Cookie's idea and sends out invitations for her own Save the Planet birthday party. Worse still, Suzie seems to think Cookie is her new best friend! Grrrr! Suzie is officially the most annoying girl in the world!

In her third adventure, Cookie finds mysteries everywhere - but can she solve them, and save the science showHurray, Cookie's Nani is coming to stay from Bangladesh! But she doesn't speak English and Cookie is the only one in the family who doesn't speak Bengali. Luckily, science-mad Cookie realises that her coding lessons at school might help her crack the language code and help her bond with Nani.Other mysteries are harder to solve, though - like, why is Jake's mum acting so weird Who is the mystery gamer who keeps levelling-up in Cookie's computer game And who is the Woodburn Hacker, who keeps posting teachers' secrets on the school website Why does it look like it might be Cookie herselfCan Cookie solve these mysteries, clear her name and save the science show