While I love gritty NYC detective films, This one is rather disappointing. The atmosphere is destroyed in the first few minutes intercutting Sinatra's wife kidney operation with the murder of a New York accountant. Unnecessary and repulsive., it takes you out of the suspense. The movie is a shell of the novel on which it was based in which we really get into the mind of the killer and his motives, and how he is swayed into murder for fun by a psychotic girlfriend. This is completely left out of the film, as well as the NYC politics within the police department. We really don't know anything about the killer in the film, and his identification as the killer is ridiculously fast, as well as the conclusion. The film reminds me a lot of Cruising, also released in 1980, which also had a rushed look to it, and felt incomplete. But that is understandable in Cruising because of the gay community protest of the film during location shooting. The First Deadly Sin had no such problems, unless Frank Sinatra who was notorious for being impatient during shoots, refused to elaborate on the location shooting. However, even a mediocre film from the 80's is a hundred times better than the Marvel garbage on the screen today. Their are some great supporting performances by Sinatra's amateur helpers and a sleazy doorman. Overall worthwhile seeing, but not anywhere as good as it should have been