Vera Campbell is an attractive young woman who is an undercover agent for the British government. She is ordered to cross the sea aboard the Britannic in hopes of learning more about German spies who may attempt to sabotage the great ship. During the course of the voyage, Vera becomes infatuated with Reynolds, the Britannic's chaplain; he also finds himself attracted to her, but while his status as a man of the cloth presents an obstacle in their romance, it's nothing compared to Vera's discovery that Reynolds is one of the German agents she's been assigned to ferret out.