A Blueprint for Murder

Joseph Cotten

Whitney 'Cam' Cameron

Jean Peters

Lynn Cameron

Gary Merrill

Fred Sargent

Catherine McLeod

Maggie Sargent

Jack Kruschen

Harold Y. Cole

Barney Phillips

Detective Captain Pringle

?

Freddy Ridgeway

Doug Cameron

Harry Carter

Wheeler (uncredited)

James Gonzalez

Joe Cunningham (uncredited)

Ed Hinton

Ed (uncredited)

?

Jonathan Hole

Dr. Stevenson (uncredited)

Mae Marsh

Anna Swenson (uncredited)

Carleton Young

Frank Connelly (uncredited)

?

Joyce McCluskey

Nurse Bobbie Brownell (uncredited)

?

Grandon Rhodes

Probate Judge James J. Adams (uncredited)