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The coroner rules that the wife of advertising executive Andrew Anderson (David Wayne) died in an accidental fall. But after receiving an anonymous letter, police detective Sgt. Cresse (William Conrad) becomes convinced that Anderson murdered his wife. Arranging an elaborate hoax, the relentless Cresse hopes to trap Anderson into breaking down and confessing -- but things don't quite work out that way. This episode was scripted by Richard Matheson, here billed pseudonymously as Logan Swanson.