When Sergeant Billy Graves is called to a 4:00 a.m. fatal slashing of a man in Penn Station, his investigation of the crime moves beyond the usual handoff. And when he discovers that the victim was once a suspect in the unsolved murder of a 12-year-old boy, the bad old days are back in Billy's life with a vengeance, tearing apart enduring friendships forged in the urban trenches and even threatening the safety of his family.