The Hardy boys embark on another puzzling mystery when they try to discover who is stealing rare collections of ancient pirate treasure and smuggling them out of the United States.

Frank and Joe Hardy tackle native voodoo, a dangerous gang of criminals, and a mysterious ghost when they set out to search for their father in the Caribbean islands.

Despite attempts against their lives, Frank and Joe accept a case involving the most powerful man in a small town in Georgia and an allegation of piracy and smuggling.

Frank and Joe receive the unexpected delivery of a falcon, which is nearly stolen upon arrival, and leads them into a case of smuggling.

Frank and Joe are harassed when they try to locate a descendant of the Aztecs.

Vicious traps and threats beset Frank and Joe as they search for two stolen, famous paintings in an old fort said to be inhabited by a ghost. One of the paintings is a clue to the hiding place of a chain of gold.

Frank and Joe uncover a plot to steal a vital top-secret instrument of the space program. They go off to jungle-filled islands to uncover a spy ring and recover their father's stolen documents.

Their SOS ignored in a storm, the Hardy boys find a wallet containing two thousand dollars alongside their boat and are launched into a mystery involving diverse clues.

Who is writing threatening notes? How could anyone get into the impenetrable secret room of the old mansion? As Frank and Joe investigate, robbery and mistaken identity complicate matters.

When thieves hijack a collection of stuffed animals from a country auction, Frank and Joe Hardy pursue the getaway car and are drawn into a thrilling mystery. The recently acquired interest of their best pal, chubby Chet Morton, in taxidermy as a hobby adds fresh twists to the puzzle.