The investigation leads Logan and Barek to suspect the involvement of "dirty cops" and the murder of a police officer's son.

In this installment, Detectives (Chris Noth) and Carolyn Barek (Annabella Sciorra) investigate the death of a man who was murdered by the mob and thrown into a river with chains on his feet. The case quickly evolves from a single homicide into a complex unraveling of a gang war . Key Plot Points

While the specific tag S5E4 applies to Law & Order: Criminal Intent , the title "Unchained" appears in other popular TV contexts:

Disappointed we’re not going to get a season 4 of TDF Unchained

The detectives discover that the mafiosi actually killed the wrong man .

This episode features the partnership of Logan and Barek. Director: Directed by Bill L. Norton . Writers: Scripted by Stephanie Sengupta .