When her friend Monday Charles goes missing and Monday's mother refuses to give her a straight answer, Claudia digs into her disappearance.

"A painting has been stolen...! When Rami sees a floating girl in the museum, he knows he has seen her somewhere before. Then he realizes: She looks just like the girl in the painting that has gone missing. But how does her appearance connect to the theft? Agatha the turtle knows--she has been watching from the garden. But she can't exactly tell anyone...can she? Will Rami, with the help of his classmate, Veda, be able to solve the mystery? The clues...

The Alden children must solve a double puzzle which involves an old friend of Aunt Jane's, romance, and a chase.

"A high-pitched loud sound in an elevator shaft sends young sleuths Abbi, Daniel, and Lydia on the hunt for the source"-- Provided by publisher.

Six eccentric guests are invited to the home of the infamous Amadeus family where they must work together to uncover the truth behind a thirteen-year-old mystery before the clock runs out.

Nate and his dog Sludge try to solve a case on Halloween night and find themselves locked in a haunted house.

The first book in the #1 bestselling phenomenon sends readers around the world on the hunt for the 39 Clues!

Minutes before she died Grace Cahill changed her will, leaving her decendants an impossible decision: "You have a choice - one million dollars or a clue."Grace is the last matriarch of the Cahills, the world's most powerful family. Everyone from Napoleon to Houdini is related to the Cahills, yet the source of the family power is lost....

After learning about Sherlock Holmes, Humphrey the classroom hamster follows clues to try and 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.

Third-grader Dink and his detective friends hope to receive a big reward by finding the person whose video recorder picked up a picture of the local bank robber.

Twins Theo and Alexander along with their sister Wil are abruptly dropped off at their Aunt Saffronia's house, where they learn they must complete a series of tasks in order to see their parents again, the first of which is solving a mystery at the Fathoms of Fun waterpark.