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

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

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

When his haunt is torn down and he is separated from his ghost family, Kaz befriends human Claire, who has the ability to see ghosts, and helps her investigate a haunting at the local library.

An elite group of underdogs trained to fight crime must save their unique school from shutting down.

Hazel Sinnett is a medical student in 19th century Scotland who, after being kicked out because of her gender, works with new attractive acquaintance Jack Currer to procure dead bodies to study, but they soon discover secrets buried in the heart of Edinburgh society.

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....

"When the creator of a high school gossip app mysteriously dies in front of four high-profile students, all four become suspects. It's up to them to solve the case"-- Provided by publisher.

The children are spending the summer on their own private island but there is a mysterious stranger on the island.

Hoping to become the greatest detective that ever grew, Inspector Flytrap, a Venus Flytrap, and his assistant, Nina the Goat, investigate "big deal" mysteries at an art museum, a cookie shop, and a garden.