A Blueprint for Murder 1953

Whitney Cameron is in a quandary: he's attracted to his beautiful sister-in-law, Lynn, but also harbors serious suspicions about her. Her husband, Cameron's brother, died under mysterious circumstances, and now that the death of her stepchild, Polly, has been attributed to poisoning, he suspects that Lynn is after his late brother's estate, and killing everyone in her way.

Cast:

Joseph Cotten
Whitney 'Cam' Cameron 

Jean Peters
Lynn Cameron 

Gary Merrill
Fred Sargent 

Catherine McLeod
Maggie Sargent 

Jack Kruschen
Detective Lieutenant Harold Y. Cole 

Barney Phillips
Detective Captain Pringle