The investigation into Doc's actions starts. Rose invites Bosco to dinner, unbeknown to him with his brother. Fred is upset that Faith is partnering with Bosco again. A dead body is found, near signs that a drug war is starting. Cruz is miffed at being left out of a raid.
Questions are asked about why Cruz and Dade were watching Bosco's brother. Autopsy reveals that Dade was poisoned by Teflon on the bullets. Bosco searches for Mikey. Mikey says he was the driver, but not the shooter.
Bosco's father engages an expensive lawyer for Mikey. Kim gets caught up in a rave where anti-crime and the drug squad are making a raid, and a fire is started. Cruz continues to compete against the drug squad.
Sasha returns to work. Bosco prepares for his brother's court appearance. Sully's breakfast routine is broken when the owner of a restaurant he frequents is killed in a hold-up. Rebecca collapses, and it is found that she has been badly abused. The LSAT results arrive.
Sully and Ty discover a headless body in the trash. A new medic joins the team. Faith sits vigil with Rebecca, and tries to understand how a mother could allow this to happen to a child. Mikey is located.
The shooting at Mann's apartment is investigated, and all involved stood down for three days. Upon their return Faith gets served, and receives a promotion. Cruz has a new boss and gets an anonymous tip about a rat in the house. Ty meets up with some old foes and bungles their arrests. Munroe has a secret.
Ty gets a rookie partner with family connections to IAB. Carlos gets cursed by a patient's psychic. A Chinese bride is shot at her wedding. Faith asks Fred if their kids can attend her promotion ceremony at One Police Plaza. Monroe finds a way to connect with Yokas.
Faith starts duty as a detective, with Jelly filling her in on the details. Sully and Monroe attend a domestic and discover a suicide in the upstairs apartment. Faith takes an interest in the guy's background and finds he may have killed a woman. Sasha and Ty make up, then find a dead body in the garbage by the squad's house.
Miller recognizes the M.O. of the body found dumped by the squad house and works on the case with Yokas. Finney and Buono get talking. Carlos denies there is anything happening with him and Levine. Munroe is working to a deadline. Carlos and Buono are ambushed. The murderer hands himself in - after he has set up another girl to die slowly.
Faith and Fred go to court to fight for custody of the kids. IAB interrupt, taking Faith away with them. A cute new firefighter arrives. Cruz is denied bail and sent to Rykers on remand. Under full immunity, Faith confesses the truth. A potential suicide causes problems. Sully tells Ty something about the history between himself, Ty's father, and C.T. Finney. Bosco wakes up.
Munroe looks into the past. A missing councilman is found by Carlos and Grace in a bloody and dazed state. Fred's girlfriend reports Charlie missing to Faith. Finney Sr gets wind of Ty's investigations into his father's death.
Faith and Jelly investigate the murder of a Muslim school girl and Faith suspects an honor killing. Ty continues to ask questions about his father. Munroe's secret is revealed. Brendan is a hero and gets a second chance with Grace. Emily makes a choice.
Ty reveals Munroe's secret to the squad. When Munroe and Finney Jr are attacked, there is little response to their 10-13 call. Faith investigates the murder of a retired IAB detective. The fire crew have a has-been actor on a ride-along to study for a part.