Beginning with an advisory title warning viewers that "any resemblance to any other worlds, known or unknown, is purely coincidental," this Powell-Pressburger fantasy is that rarest of cinematic achievements: a sophisticated romance with an extraordinary visual design. The story revolves around an RAF squadron leader (David Niven), who establishes radio contact with an American WAC (Kim Hunter) shortly before abandoning his burning plane over the English Channel. By rights he should have perished, but in this otherworldly tale he receives a reprieve from a heavenly tribunal and begins to pursue the woman whose voice had guided him home.