The Caribbean Cruise Caper

The Caribbean Cruise Caper is volume 154 in the Hardy Boys series of detective/mystery books by Franklin W. Dixon, published in 1999.

Plot summary
Frank and Joe Hardy go on a Caribbean mystery cruise. The cruise allows teenage detectives to solve simulated crimes with the Hardy Boys as judges.

However, someone onboard soon puts the ship in peril. Frank and Joe, with the help of the young detectives, must find the culprit before the ship sinks.