Dink Duncan and his two friends investigate the apparent kidnapping of famous mystery author Wallis Wallace. A is for author.... Dink writes to his favorite author, mystery writer Wallis Wallace, and invites him to visit Green Lawn. To Dink's amazement, Wallace says he'll come! But when the big day arrives, Wallace is nowhere to be found. The police think he just missed his plane, but Dink suspects foul play. It's up to Dink and his two best friends,...

Cam investigates when a thief steals her mother's video camera and a tape containing footage of a big scary snake.

Dink and his friends investigate why pets, like Mrs. Davis's canary, Mozart, are mysteriously disappearing all over town.

Cam uses her photographic memory to identify the person who stole a valuable autographed baseball. When she notices some bones missing from a dinosaur skeleton exhibited in the museum, a young girl with a photographic memory tries to discover who has been taking them and why.

Ten-year-old Cam, possessor of a photographic memory, and her friend Eric investigate what seems to be a brief appearance of U.F.O.s.

When a weird blue chicken comes to Chicken Squad headquarters for help, siblings Dirt, Sugar, and Sweetie help find her missing house.

A rare Chinese vase is stolen from a pottery shop. Nancy and the owner of the shop feel that locating "the leaning chimney" will provide the clue to the vase and other stolen articles.

On her first day in New York City with her younger brother, Kevin, twelve-year-old Lexi overhears thieves discussing where to hide stolen jewels, and the siblings, along with their aunt's neighbor, Kim Ling, skip day camp to investigate "the crime of the century."

Valuable electronic parts containing platinum are being stolen from shipments made by Stanwide Mining Equipment Company's cargo planes, and Frank and Joe Hardy are called upon to assist their world-renowned detective father to solve the baffling case. At Stanwide the boys pose as employees, and become suspicious of their boss's hostility toward them. Is he involved in the racket? And what is the truth behind the plane crash at sea in which Clint Hill,...

The reader is asked to help Nate the Great solve the mystery of his friend Annie's missing dog Fang.