Ruth Bowman is a new bride glowing with delight as she and her charming new husband, John, set sail on the SS Monrovia for a transatlantic honeymoon. But when John inexplicably vanishes, Ruth discovers that no one on the ship has any record of his existence. As she slips into hysteria, Ruth has to prove that her marriage and John's existence is not just her own delusion. The ship's physician, Dr. Paul Manning, might be the only person on board who...