A chaotic street takeover finds our officers grossly outnumbered, revealing philosophical rifts inside West Division.

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.

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.