Munch Mancini had to fight her demons to get a decent life. Now she swears revenge on those who would wreck it. Working as a mechanic and settled with her daughter, Munch is about to marry a police officer whom she loves deeply. But it all comes crashing down when a friend in the Police Department calls to tell her that her fiance is dead, shot down by his fellow cops in a drug bust gone wrong. Refusing to believe the explanation she is given, Munch goes on a dangerous mission, first for knowledge, and then for revenge.