Dangerous Crossing

Newly married heiress Ruth Stanton (Jeanne Crain) sets out on a luxury honeymoon cruise -- only for her new husband to promptly disappear without a trace. Even stranger: no one else on board can confirm that the man really existed in the first place. With the help of the ship's physician Dr. Manning (Michael Rennie), Ruth sets out to prove she's not insane and to get to the bottom of a sinister conspiracy.