Gambling boss Greg Morella runs a crooked ship-- all the gaming tables on his floating casino are rigged. Because the ship operates outside of the three-mile state limit, the authorities can't get the evidence they need to convict Morella. Roving reporter Jim Carver thinks he can get the goods on the kingpin. He enlists Morella's secretary Laurie to help him secure evidence of the fixed games as well as proof that Morella murdered his partner Max Gates.