Under-appreciated British crime thriller with antisocial characters and an antisocial plot: a convict finds out his wife is pregnant by another man, so he busts out of prison to hunt her down with every intention of killing her. No time wasted on "redeeming" characters. No goofy humor or chase scenes through clubs playing bad, dated music. Just a spare, tense study of two vicious men (Oliver Reed, Ian McShane) hot on the trail of a treacherous moll (Jill St. John). A nemesis detective (Edward Woodward) tries to intervene, but never fouls the nihilistic tone. Solid performances and one of Reed's best as an uber-thug who does push-ups on the ceiling of his jail cell, is sitting on a volcano, and only lets on what he has to, even to his partner. The script does the same thing, imparting information on a need-to-know basis, doing so smoothly as it races toward Hell. All in the back-lots and stygian prisons of a cold, drab London, with a musical score by Stanley Myers that perfectly enhances the story and mood. A must for fans of seventies crime thrillers, British or otherwise, that take no prisoners.