this be not a mystery and but a very good thriller . then why there mystery tag . well apart from that and it really a very good movie . a chill thriller . i do not feel this be a total film noir . sinatra play a very good role a baron the assassin . the movie portray baron psychological struggle with his captive and and present an interesting portrait of what nowadays be a controversial matter and the function of firearm in the home . ironically and sinatra character present himself a a war hero and while sinatra be 4 f during world war ii and sterling hayden serve with the united state marine corp and receive the silver star for his gallantry in the european theatre .