As Walter Clark Jr. is interviewed about his career, he reflects on his journey from homicide detective to the NYPD's youngest police commissioner.

When a high-end call girl is found dead, Clark learns that his archenemy, Deputy Mayor Holbrook, was her last client. Meanwhile, Diaco struggles with the decision to put his father in a nursing home.

When Clark is relegated to desk duty, he delves into Owen’s cold case in which the murder investigation of a construction worker was compromised by the events of 9/11. Meanwhile, Deputy Mayor Holbrook pulls a gun on Clark and Margot, Agnes drives away with her father, and Owen gets his long deserved promotion.