A cryptic message from their famous detective father and a note secreted in a ventriloquist's dummy lead Frank and Joe Hardy on a dangerous search to the tropical islands in the Caribbean. There the teenage detectives are constantly beset by the vicious henchmen of a criminal mastermind. Danger stalks the boys' every move, once in an isolated sugar mill, another time in a shark infested sea. To add to their hazards, one of the young henchem closely resembles Joe and fiendishly makes use of this strange coincidence. Recommended for ages 8 to 14.