Danny and Baez investigate the murder of a man who was living a double life with two separate families, and Anthony tries to resist when Erin asks him to help investigate his old partner, whom she suspects of stealing drug money. Also, Frank deliberates between two candidates for the chief of transit position.

After a woman voices her outrage regarding the NYPD's inability to find her son's murderer, Danny reexamines the case, upsetting the original detective, Erin, and Anthony, who didn't pursue the case due to lack of evidence. Also, Eddie is shot while on duty; Erin and her ex-husband, Jack, face off in court; and Frank contends with an angry police force when Mayor Dutton fails to defend them at a press conference.