I felt echoes of "The Lady Vanishes" while watching this story unfold as we follow “Ruth” (Jeanne Crain) on a cruise liner. She set sail with her new husband, “John,” but he’s disappeared. It's not just a disappearance; there isn't any sign of him anywhere. The Captain (Willis Bouchey) and the ship’s doctor "Manning" (Michael Rennie) seemed skeptical about her mental state – and as she grew increasingly agitated and …