Marie Windsor playing a comely nightclub piano player unintentionally sets Franz off on his serial killing spree and in the process becomes his first victim. The script and acting by Franz as the sniper" with his mannerisms and facial tics is extremely convincing.
A lot of on location San Francisco adds to the enjoyment of the film. As part of the Columbia Pictures Film Noir Collection Vol 1 it has an excellent and informative commentary by Eddie Muller whom novelist James Ellroy has dubbed him "The Czar of Noir". So the film can be enjoyed twice 8/10