Sully is sober and back on the job; Faith continues to keep a close watch on Emily; a mutual attraction springs up between Kim and a reporter; Faith and Bosco pursue a man after he steals a bag of money from an overturned armored car involved in a fatal accident; Faith is unable to dissuade Bosco from wanting to hide the cash after the robber drops it, rather than carrying such a heavy load during a foot chase, and is proved right when they return later to retrieve the bag and find that it's been stolen yet again; faced with disciplinary action and investigations by the Major Case Squad and IAB, they pound the pavement trying to find the second perp and discover that the accident with the armored car had been staged by one of the guards and his girlfriend; Maritza ends up stealing the first perp's collar from Faith, which further erodes their relationship; Bosco is jealous when the Major Case Squad detective running the investigation turns out to be Maritza's former boyfriend; as Doc and Kim rush Nicole West to Mercy after a suicide attempt, she tells Kim that her stepfather Anthony has been molesting her; when Nicole's mother refuses to believe that her husband has done anything wrong, Kim implores Melinda to see that her daughter is crying out for help with repeated suicide attempts; after Nicole convinces Melinda that Anthony is guilty and reveals that her accusations against Carlos were false, Melinda apologizes and withdraws her complaint against Carlos and the city; still at odds over trust and honesty issues, Faith and Bosco trade painfully honest barbs and decide to split up; Carlos is elated when Ty tells him he's being reinstated.

Kim is invited to a party by Noble. Noble is arrested through an undercover operation. He becomes an informant and helps Cruz and Bosco bust a Meth ring. Faith officially requests a new partner. Emily and Faith face off about Eric.

Cruz's desire to find the ring leader of the Meth ring puts Bosco in a uncomfotable position. Faith tries to improve her relationship with Emily and also gets a new partner, Sasha, at work. Noble is released and sets up a new date with Kim.

Maritza's reckless pursuit of Buford triggers a horrific car accident that leads to multiple injuries to motorists, and triggers an explosion that severely injures Lt. Johnson and kills Alex Taylor; Doc and Kim get to the top of the promotion list; Maritza hangs Bosco and Nunez out to dry over the murder Noble committed; Doc's overwhelming guilt and grief over Alex's death leads him to a career decision; Maritza discovers that Faith has agreed to help Bosco clear Nunez by getting Noble's gun, and goes to Noble's place to intercept her, followed by Bosco and Noble; when Bosco insists on arresting Noble and Faith refuses to turn over the gun, Maritza draws on Faith, Bosco and Faith draw on Maritza, and three shots ring out.