When a well-regarded, newly retired NYPD lieutenant is accused of shooting a group of potential muggers on the subway and then disappears, Frank must deal with the fallout. Also, when a drug dealer returns to Baez's old neighborhood, she and Danny must figure out how to arrest him for a murder that Baez witnessed as a child.

Erin is overwhelmed with guilt after a man she set free is accused of killing a cop. Also, Frank and Mayor Poole continue their game of political chicken over Frank's reappointment as commissioner, and Danny and Baez investigate a case of a cop who has gone AWOL.