A cryptic message from their famous detective father and a note concealed 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 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. But when Frank and Joe come face to face with the ghost at Skeleton Rock,
it will be as much of a surprise to the reader as it was to the young detectives
themselves.