Andy and Sam return to work; Andy's attacked at Traci's and the Sex Case Unit wants the case.

Andy and Traci deal with a missing person case. Dov and Marlo dig deeper in to the Division Bombing while Chris is trying to keep his secret while Andy is dealing with the heart breaking news.

Andy, Nick, Gail, and the new officer Juliet Ward go to a women's prison for a prisoner transfer. However when a riot starts, the four are separated with Andy and Juliet trapped with a desperate woman.

When Nick disappears after his older brother resurfaces with new information about something from his childhood, Juliet is right on his trail. Meanwhile, 15 Division's officer's are on a trail of their own when convict escapes from prison.

Traci is taken before her first raid, and 15 Division has a couple of suspects to look into. While they scramble to find her, Traci works an escape from her angle.

A drive-by shooting occurs at a community-outreach baseball game where Gail is trying to impress the woman who decides whether she is suitable to adopt Sophie.

Andy and Sam work to clear Oliver of suspicion in the evidence room bomb, whilst the rest of 15 Division work to find a missing boy.

Traci follows Steve, trying to disprove her fears of his having anything to do with the bombing. Meanwhile, Dov, Gail, Nick and Andy work on a risky plan.

15 Division tries to move past the scandal as a heat wave hits and Jarvis opens the doors to the public as a cooling station. Meanwhile, Andy and Marlo go looking for a missing woman and Oliver returns to work as a beat cop.

Dov and Andy cover a music festival where a girl ends up dead due to drugs. Gail goes to court and is unsure whether lying for her brother is the right thing to do. Nick gives Juliet another chance.

On their wedding day, Andy has her car stolen on her way to the church, while Sam gets an uninvited guest.