When her mother, who disappeared 16 years before, reappears while a true crime documentary about her case is being filmed, 18-year-old Bel, not buying her mom's unbelievable story about what happened to her, must uncover the real reason Rachel Price is back from the dead.

Hazel, a twelve-year-old aspiring detective, must decode a series of ominous clues tied to a century-old tragedy to find a missing teenager before it is too late.

When twelve-year-old Rayleigh discovers he is part monster and that his dad, the Supreme Scarer, is missing, he journeys to a magical world below London where he must fight the most frightening, decide what sort of monster he is at heart, and find his father.

Following the clues left behind, Theo and Alexander find themselves at Siren's Song Seaside Amusement Park, where they must work together to escape, stop their newfound nemesis Essa, save Wil and their friends, and find their parents.

When everyone in town disappears without a trace, twelve-year-old Eddie and his friends, with no parental supervision, must figure out what happened to their families, but as they each deal with their fear differently, their friendships begin to fracture.

Seventeen-year-old Alyson discovers her classmates' dark side when a top-secret competition to see who has the most sexual prowess ends with a popular LAX captain's disappearance.

Twin sisters and budding geniuses Wiki and Leen Ellison have never been apart, but this summer Leen is going to Cosmos Camp and secretly Wiki is looking forward to being alone--but when the camp founder disappears both girls are recruited to solve the mystery before his newest invention goes terribly wrong.

"When Dr. Alistair Fairfleet, the Institute's eccentric chairman, disappears on the first day of Alex and Asha's summer vacation, they receive a letter written by the missing millionaire inviting them to a mystery involving complicated clues and puzzles. It is just the sort of case they've been waiting to tackle. But nothing in the Fairfleet case has a simple solution. As the kids track down clues, they uncover art forgeries, archaeological crimes,...

"After saving Paris from a Snailien invasion, Stitch and his friends are off to the big apple. People have been disappearing all over New York City, and the Galactic Detective Agency suspects that a group of shapeshifting aliens are to blame. Now it is up to Stitch to figure out what has happened to the missing people and save the day. But how do you a solve a mystery when the suspects can disguise themselves to look like anyone, maybe even your best...

Witty typewriter Olivetti and twelve-year-old introvert Ernest embark on a mission to find Ernest's missing mother that takes them across San Francisco.