Lt. Fancy tells Diane that the NYPD is ready to close in on Jill for her relationship with Don. Diane lets an angry Jill know the truth, and Jill tells Diane why Don has leverage over her. The squad comes together to deal with the Don situation once and for all. Andy stays by Theo's side as his son goes through tests to see whether or not he has cancer. An interdepartmental shakeup leads to permanent change.