A reporter on a transatlantic cruise finds himself accused of the theft of valuable stamps. Knowing that he didn't do it, he sets out to find the real thief, but isn't prepared for what he discovers.
When 'Gentleman' Burton boards the Capri his aura of mystery makes the crew curious about his origins and makes him especially attractive to the Captain's daughter. But he little realises the danger that is to unfold when the Captain conceals diamonds on board as a favour...