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When the Hardy boys eagerly agree to assist their friend Jack Dodd and his father in locating a family treasure, the two young detectives are unaware of the baffling complications that will arise. The only clue to the long-lost treasure is a cryptic message written by a Pilgrim ancestor. But when Mr. Dodd and Jack are accused of stealing cars and then mysteriously disappear, Frank and Joe are confronted with a triple mystery. Have their friends run...

An anonymous diary is a mystery with handwriting that is difficult to decipher. It is filled with technical drawings and chemical formulas. Was the destructive explosion an accident or an act of revenge?

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

After a family tragedy, Jacob feels compelled to explore an abandoned orphanage on an island off the coast of Wales, discovering disturbing facts about the children who were kept there.

Teenage detectives Frank and Joe Hardy investigate a supposedly haunted house reported to be the hangout of criminals.

Nate the Great solves the mystery of the missing picture.

When the umpire at the baseball game fundraiser is accused of stealing a collection of autographed baseballs, Dink, Josh, and Ruth Rose try to prove his innocence.

Fifth-grader "Encyclopedia" Leroy Brown solves ten mysteries and, by putting the solutions at the back of the book, challenges the reader to do the same.

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.

Dink and his two friends help Lucky find the culprit who stole Lucky's winning lottery ticket.