Diaz learns that Harmon has enemies within West Division, and begins to fear she cannot be trusted.

Desperate for a lead, Harmon goes off book resulting in a major breakthrough and a deadly showdown.

Back on patrol, the rift between Harmon and Diaz comes to a head.

When Diaz's family is threatened, Harmon realizes she must break her own rules to fix it.

A shot caller's revenge mission results in West Division going head to head with an entire gang.

Harmon and Diaz join forces with an elite squad to intercept a major drug shipment.