Maureen O'Hara is a young girl who lives a well-to-do existence with her family until she takes a shine to her art teacher "Lambert" (Dana Andrews). Their relationship doesn't impress her family, but they press on anyway, set up on their own before, fairly soon, she rues the day. He turns out to be a bit of a lush. When an accident befalls him, she finds herself the subject of a pernicious blackmailing from an elderly neighbour - "Mrs. Mousey" (Dame Sybil Thorndyke) and her miserable life looks pretty set. Until, that is, another man enters her life - a man who bears a startling resemblance…