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The Alden children hunt for their late grandmother's necklace that has been missing for years.

The Alden children help solve the mystery of a missing spyglass that has kept two brothers feuding for years.

Dink Duncan and his two friends investigate the apparent kidnapping of famous mystery author Wallis Wallace.

Nate and his trusty dog, Sludge, investigate when Rosamond's cat, Little Hex, turns up missing on Halloween night.

Amy and Dan, members of the powerful Cahill family, try to uncover the thirty-nine clues which will reveal the secrets of their lineage and find out what really happened to their parents.

Twelve-year old Johnny Dixon and his friend Professor Childermass look for the hidden will left by an eccentric cereal tycoon who wished to make life difficult for his heirs after his own death by suicide.

Young detectives Frank and Joe Hardy, investigating the disappearance of a professor, encounter a hot-tempered hermit, and sabotage at the radar station and Honeycomb Caves.

Once again, America's ten-year-old Sherlock Holmes in sneakers is called upon to help his police chief father and the neighborhood children solve ten mysteries.

The Alden children draw upon their resourcefulness to save the neighborhood firehouse from being torn down, while they also face a series of mysterious incidents connected with it.

The Aldens become involved in a community theater production of "The Wizard of Oz, " which is systematically and mysteriously being sabotaged.

While helping their grandfather prepare for Greenfield's Winter Festival, the Alden children uncover a mystery surrounding the statue in the town square.

Nate the Great helps his friend Annie solve the mystery of the missing picture.

Fifth-grade sleuth Cam Jansen uses her photographic memory to solve a monkey smuggling mystery at the city zoo.

Big Max, the world's greatest detective, helps find the elephant that was stolen from the King of Pooka Pooka.

Dog detective Sebastian helps his master protect a mystery patient at City Hospital, at a time when an attempted coup has just occurred in a nation friendly to the United States.