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When a police informant's murder points to the involvement of the notoriously brutal East Jameson gang, the division realizes that cracking this case will not be easy. And when Gail's intimidating mother, Superintendent Elaine Peck, arrives on the scene, there is even more pressure to solve the case. Meanwhile, Andy finds herself paired with Detective Rosati, whose unintentional disclosure of a secret puts Andy's relationship with Luke in jeopardy. And Gail, stressed out by her mother's presence in the station, is assigned to protect the only known witness to the crime -- a seemingly homeless eight-year-old boy with a shocking secret of his own.
Luke: Let's get married.
Andy: Uhh, we are.
Luke: Yeah, I don't want to wait. Let's go to City Hall next week, throw a big party afterwards. What do you think?
Andy: Well, I think the girl in me says "I don't have a dress."
Luke: Okay, let's get one. Come on.
Andy: Are you okay?
Luke: Yeah, I'm great. I just don't want to wait anymore.
Andy: Okay, yeah. What the hell, sure, let's do it.
Luke: It was a mistake.
Luke: I'm engaged, I'm happy. It never should have happened.
Jo: That's the story, that's what you're telling yourself?
Luke: It's the truth.
Jo: So what now? We just never talk about it again, that's it?
Jerry: Is there a warrant I'm not aware of?
Andy: Well, Sam said the gun was in plain view?
Jerry: "Plain view," plain view? Or plain view for Sam.
Throughout the entire episode Superintendent Elaine Peck keeps calling Chris "Craig." However, the second time she talks to him, she accidentally calls him Chris.
The blood pattern on Jo's head, from her attack by Deena, changes between scenes.