While Major Crimes struggles to get comfortable in their new, state-of-the-art surroundings, Brenda investigates the murder of a contractor who was having an affair with the wife of one of his clients.
As Brenda contemplates applying for the promotion, her case involving the possible suicide of a drug addict becomes complicated when she uncovers a custody battle between the victim and a dying father.
Flynn and Provenza's double date with a pair of flight attendants gets Major Crimes caught in the middle of a pair of murders connected to drug trafficking, after Provenza finds a dead body in the woman's apartment.
Major Crimes takes a homicide that appears to be a Mexican cartel murder, but they soon discover a possible alternative motive. Meanwhile, Provenza questions whether Sanchez is actively searching for Ruben's mother.
In order to satisfy military authorities after three Army Rangers are killed outside a nightclub, Brenda is forced to make an immunity deal with a gang member who is the twin brother of one of the victims, which backfires badly.
While Brenda waits for the mayor's final decision for police chief, she is forced to work with one of her competitors in a case involving a man who murdered a pair of paramedics, and who may hold a grudge against first responders.