After socialite Lynn Llewellyn receives an anonymous threat, he is poisoned at his uncle's casino, and although he recovers, his wife is murdered by the same killer.

Ruth Raymond works on the telephone switchboard of a large NYC office building. One day, a private detective informs her that she is actually the daughter of railroad tycoon Luke Carson, and that she had been kidnapped as a baby 14 years ago by Luke's vindictive brother Elwood, and placed with strangers.