Richard Kuklinski killed for the mob for decades while coaching his daughter's sports teams and living in a New Jersey suburb with a wife and children who suspected nothing. This film is built almost entirely around his own words, filmed in prison interviews where he describes his methods in a flat, unbothered voice, including his signature trick of freezing victims to disguise time of death, the detail that gave him his nickname. Investigators and journalists who tracked his killings fill in the cases he glosses over, and his family appears on camera grappling with the gap between the father they knew and the man on the tape. The film does not dramatize with reenactments; it lets Kuklinski talk, and the discomfort comes from how ordinary he sounds describing extraordinary violence. By the end the portrait is less about body count than about how completely a double life can be sustained, and how little the people closest to him were able to see.