 Working alone late at night, a marine salvage company owner grabs a revolver to follow gigantic footprints out of his office to a dock, where a frogman croaks him with a spear-gun. His co-owner, a huge, hulking frogman, claims he s too upset to talk to anybody - except his lawyer. A meek insurance adjuster (Jonathan Hole, Orville on "The Andy Griffith Show ) hires Peter Gunn to solve a series of mysterious riverside robberies, so Gunn enlists a competing salvage diver, whose lily pad is a swinging tiki lair, complete with seductive hula dancers.