While the team investigates a massacre that included an up and coming rapper, Delk begins a major restructuring at Major Crimes, including a surprising new boss for Brenda.
An escort appears to have died from an overdose, but her mother, a Phoenix police officer, insists it's not true. Meanwhile, Raydor's continuing investigation makes Brenda comes to terms with a shocking reality.
While Major Crimes tries to stop a hit ordered from prison by a Mexican drug cartel, Brenda's attorney begins the uncomfortable task of find the leak in the department.