Following the shooting, Detective Tolbeck waits nervously for Internal Affairs Investigator Leon Fordham to arrive.

When Cullen and Tolbeck are reunited with a figure from their past, Cullen realizes that he doesn't know his partner at all. Meanwhile, Marco and Frankie open up to each other, and Janice finally unravels.

Leon throws himself a retirement party but Cullen and Tolbeck are wary of his intentions. Clint confronts Janice about her hatred for the BopBot, but the conversation quickly turns into a rehash of their romantic past.

Season finale. After losing yet another key witness in the Las Hormigas Cartel investigation, Cullen is forced to deal with the consequences... and FBI agent Dustin Kasprowicz. Janice returns to Dispatch to confront Clint and delivers shocking news.