Mary-Kate and Ashley combine a family vacation with sleuthing as they solve an aquatic mystery at Sea World.

Mary-Kate and Ashley are at Sea World with the parents, who are hard at work creating a computer program that will let humans speak with dolphins. The twins can't seem to find a mystery—until they stumble upon a mysterious body and a Lady in Black who leads them on a wild goose chase!

We're Mary-Kate and Ashley—the Trenchcoat Twins "TM" . Two super-dooper snoopers who find mysteries to solve wherever we go! Even at the Tons of Fun Amusement Park!The Tons of Fun park really was tons of fun—until we entered the Fun House. Something big and fuzzy grabbed my arm—that's when the mystery began! No problem. We were on the case! The Case Of The Fun House Mystery "TM" . So join us—you know what we say: Will Solve Any Crime By Dinner Time "TM" .

Mary-Kate and Ashley can solve any crime by dinner time. When NASA's space shuttle is held up because of mysterious holes in the fuel tank, the twins track down the clues and make a surprising discovery—this mission has gone to the birds!

A special airplane filled with gifts, goes missing from ELF Airlines on Christmas Eve, Trenchcoat Twins Mary-Kate and Ashley seek out a villain who would spoil the season for kids all over the world.

The sharks at Florida's famous Sea World are singing. Everyone knows sharks can't sing, so someone must be playing a trick. The Trenchcoat Twins consult with fish expert Dr. Charlene Finn to get the clues to solve the fishy mystery. photo insert.

While touring Hawaii, Mary-Kate and Ashley realize that a clever thief is on the loose at their fancy hotel, stealing gold, silver, and jewels from fellow guests, and prompting the Trenchcoat Twins to hunt him down. Original."

Exploring the Mexican jungle, Mary-Kate and Ashley meet three miners who think they are being chased by a monster, and seeking to disprove the monster's existence, the twins discover strange, snow-covered footprints. Original.

With the help of the U.S. Navy, the sleuths uncover the truth about a mysterious object that crashed on an island near Hawaii!

Investigating the spooky, deserted Thorn Mansion, Trenchcoat Twins Mary-Kate and Ashley seek out the truth behind such mysteries as an eerie humming noise, puddles of mysterious goo on the floor, and a strange thick fog. Original.