Mannion confronts his No. 1 enemy, Dimitri Putin, and learns who killed Det. Danny McGregor in this pivotal episode. A Russian woman, Erin Vratalov, comes aboard Mannion's boat, claiming she needs protection from Putin. She tells Mannion that Putin ordered her husband, Yuri, to kill the chief. But when Danny died in the assassination attempt instead, Putin had Yuri murdered and is now after her. She also claims Yuri had a tape recording of Putin giving the order to murder Mannion, but she doesn't know where it's hidden. So begins Mannion's race to find the incriminating evidence, a search that leads ultimately to a volatile face-to-face encounter. Nancy seeks help in her ex-lover's murder investigation.

Page and Debreno investigate the murder of a reporter discovered in an abandoned building. Evidence points them to a man who uses a wheelchair and claims the victim was already dead when he found her. Mannion goes to NY for his daughter's graduation from the police academy and has difficulty saying goodbye to Sherri. Ella goes to Ricky's school to check why he has problems with his new teacher and finds out she looks just like his late mother. Meanwhile, Parras meets a charming man in a cab and thinks he might be "the one," while Brander confesses his love for her.