Fitch's past comes back to haunt him when his old New York nemesis, Albert Stram, makes his presence known in Detroit just as the veteran detective is enjoying spending time with his son, Bobby. Stram's not so subtle threats shake the usually unflappable Fitch. Meanwhile, the other detectives are called to the scene of a horrific homicide to find an entire family brutally murdered. Fitch tries to put the pieces of the puzzle together and it leads him to a devastating conclusion. With his back against the wall, Fitch asks Washington to protect Bobby, then leads Longford and Mahajan on an extremely dangerous mission to trap Stram; but which side of the law will he come down on in order to save his family and those in the squad? Meanwhile, Longford has second thoughts about his retirement; but is it too late? It's a crucial turning point in the lives of all the detectives.