There are some similarities here with a great B-level film made close to 40 years later "Miami Blues". Both focus on desperate, lawless men with soft spots for a pretty, child-like woman, who abuse the power of a police badge in a violent, supremely ill-advised attempt to settle into a comfortable, anonymous existence in the "paradise" of America's suburbs. And as with "Blues", the last 30 minutes are as frantic and exciting and darkly comic as anything you will see.
The film isn't perfect. There are weak links in the cast: Marla English is unremarkable as the trusting girlfriend, Herb Butterfield doesn't register as a pesky reporter (and John Agar's nagging conscience), and I found snarling Emile Meyer to be a disproportionately cynical police captain consumed with disgust for mankind. But Edmond O'Brien is suitably sweaty and hard-boiled as the corrupt cop (though damn, he is one puffy and bloated leading man), Agar is fine as his conflicted protegee (just before Agar moved into his mostly bad sci-fi phase) and Carolyn Jones spices things up big-time as a spaghetti loving floozy.
Starts off looking sort of cheap and routine but it's one of those films that sneaks up and surprises you. Not bad at all. A little like Richard Gere's "Internal Affairs" too, come to think of it.