Andrew and Lavina Poole are newlyweds but they haven't quite hit it off. Lavina goes off alone on a three-weeks pleasure cruise but unknown to her, Andrew has gotten a job as a steward on the same boat. Whilst at sea, Andrew overhears Lavina fliting with a bright young voyager, Richard, whom she agrees to receive to her cabin that night. Andrew locks Richard in his own cabin and takes his place leading to a case of mistaken identities.