Several known criminals already have been murdered by a professional killer, leaving no trace but the "ace" game card. The police suspects a new mob is trying to take over the district. The investigating police officer Jan is victimized by a bomb himself, when he's at his girlfriend Daniela's father's Italian restaurant. Although paralyzed and suspended from work, the tuff cop continues to investigate and takes revenge on the gangsters who did this to him.

Police Commissioner Alex Glass has been twisted into a sarcastic cynic by the hard luck story that is his life and by his daily contact with the criminals of Berlin's underground. His new assistant, Shirly Mai, is an attractive and conscientious woman who embodies a quality of virtue that her boss gave up a long time ago. They have both been assigned to solve a series of gruesome murders that have been taking place in Berlin's drug and prostitution ganglands. The prime suspect is George Miskowski, a pusher who supplies Berlin's brothels and hookers with cocaine and heroin.