When his best friend Gabe is reported missing, Ali Cross sets out to find him, but he soon learns that being a kid sleuth is not easy and clues are not always what they seem.

When Charlie Hitchcock, the smartest kid at school, gets a note from the school bully, Tyler Yu, demanding a meeting, he fears the worst--but it turns out that Tyler wants him to solve the mystery of the missing magician at the Abracadabra Hotel.

"When Enola Holmes, sister to the detective Sherlock Holmes, discovers her mother has disappeared, she quickly embarks on a journey to London in search of her. But nothing can prepare her for what awaits. Because when she arrives, she finds herself involved in the kidnapping of a young marquess, fleeing murderous villains, and trying to elude her shrewd older brothers - all while attempting to piece together clues to her mother's strange disappearance....

Throughout the hunt for the 39 Clues, Amy and Dan Cahill have uncovered history's greatest mysteries and their family's deadliest secrets. But are they ready to face the truth about the Cahills and the key to their unmatched power? After a whirlwind race that's taken them across five continents, Amy and Dan face the most the difficult challenge yet -- a task no Cahill dared to imagine. When faced with a choice that could change the future of the world,...

Nancy Drew arrives in Phoenix, Arizona, eagerly looking forward to a fun-filled vacation at Shadow Ranch, but abruptly finds herself involved in a baffling mystery. The ranch is being haunted by an unknown enemy. Local people believe that the ghostly animal is carrying out the curse of Dirk Valentine, the romantic outlaw who was killed many years ago at Shadow Ranch, where he had gone to fulfill a promise to his sweetheart. Aided by her friends Bess...

When Mrs. Third Floor visits and reports paranormal activity on the fifth floor, Butterbean and the other pets set out to find the truth and save Mrs. Third Floor from being scammed by professional ghost hunters.

Philanthropist James Qwilleran and his crime-solving cats investigate the murders of a volunteer fire-watcher and a local curling champ as a mysterious crime wave engulfs the town of Pickax.

While volunteering as a magazine delivery girl in a convalescent hospital during the Second World War, Molly uncovers a mystery involving the theft of rationed food supplies for sale on the black market.

After learning about Sherlock Holmes, Humphrey the classroom hamster follows clues to try to discover why Mrs. Brisbane is gone and Mr. E, a fun but not very educational substitute, is taking her place in Room 26 at Longfellow School.