] Bergman was very effective in the role of the vulnerable young wife who becomes helpless as she experiences a debilitating nervous breakdown and near insanity while living with her mysterious husband in the home where her beloved aunt was murdered.One of the film's posters emphasized:"Doyle is bad news - but a good cop."The film's raw script was based on Robin Moore's best-selling book of the same name about the ruthless, real-life adventures of idiosyncratic Harlem special narcotics squad officers Eddie Egan (the Doyle character) and Sonny Grosso (the Russo character) - both have small cameo roles in the film and served as technical advisers for the film." When Carl proposed a deal to save his life, Jack stepped into the light to reveal his new grotesquely transformed visage -- a deathly, pure white face, green hair and an impossibly wide, hideous, permanent grin with blood-red lips ("Jack is dead, my friend.Ray's wife encouraged him to go on outside, while she made coffee.The shadowy figure knelt down in he grassy ball park and touched the grass, then was amazed as Ray switched on the park's lights to illuminate him.