Three cops become instant millionaires after saving a rich crime victim. They retire from the force and use their money to become flamboyant private detectives. They get involved in cases involving the death of an artist, underworld figures, blackmail and a fix on baseball games.
What is meant to be a pleasure cruise becomes a nightmare as murder follows murder on a small ship. With tension mounting, passengers and the crew turn on each other in a desperate attempt to identify the killer.