The Southland officers are sent out to capture a rapist impersonating a cop. While Lydia's reunited with her former partner, Russell, Sal's secret affair is revealed to his wife.
Russell's replacement investigates a possible abduction with Lydia, while Nate & Sammy check out a shooting that's part of an undercover operation.
While investigating a triple homicide, Lydia and Rene realize they have very different styles of detective work; And Ben confronts John about his reliance on pain pills.
Ben winds up in a patrol unit alone for the first time. Among the cases he has to handle on his own are a missing girl and a suspected stalking case
Lydia and her new partner, Ray Suarez, arrive in Compton, where a young USC student was murdered
After gangsters open fire in a crowded club, tensions rise between Sal and Gil on the gang task force. And Sammy confronts his wife about crossing the line too often.