Based on the real story of Richard Kuklinski, this movie tells about the history of one of the most diabolical self-confessed contract killers in American history. Richard has difficult childhood as both of this parents used to beat him up. So as grew up he became a coldblooded person. He worked as a porn film technician but his mob boss, Demeo, forced him to work for him as a contract killer. He started enjoying that so much that he found many ways to eliminate his targets. He managed to kill over 100 hundred people over twenty years. His family had no idea about his real profession as neighbors and friends were admiring them for being happy and well adjusted. His collaboration with another hit man, Robert 'Mr. Freezy' Pronge, gave him the opportunity to work alone secretly from the mobs, something they didn't like finally. The end was near but he couldn't expect it. A stunning biographical film that portraits the serial killer as well. The performances are exceptional especially Ryder's and Shannon's.