American horror in which a group of doctors are mysteriously killed one by one after being invited to the home of an ex-patient. When Kurt Ingston (Ralph Morgan) invites a few select guests to his home, he requests the company of three doctors who were tending to him during his early stages of paralysis. Now wheelchair-bound, he is unable to leave his home which he shares with his sister Margaret, whom he claims to be mentally ill, and his house staff. When the doctors are struck off one after the other, it is up to two other accidental guests, Dr Lynn Harper (Irene Hervey), a psychologist, and mystery writer Dick Baldwin (Don Porter) to find out who is behind the consecutive murders. They initially rule out their disabled host as a suspect, but could there be more to him than they first perceived?