Mrs. Argyle, benevolent tyrant and mother of five, is murdered with a poker. Her son Jacko is convicted of the crime but dies in prison. Two years later, Dr. Arthur Calgary comes forward to clear Jacko, but the Argyle family is not pleased. If Jacko didn't commit the crime, who did? Suspense mounts as the family realizes that exhonerating Jacko means fingering one of them.