Ben faces his final day as a rookie and contends with his partner’s increasing dependence on painkillers. Meanwhile, Sammy is assigned a new partner.

Sammy seeks answers in the desert; Lydia and Josie watch an important witness before a murder trial; John and Ben help a child in need.

Lydia is suspended from duty and bonds with an injured witness; Chickie is haunted by a high-speed chase; John tries to clean up a neighborhood.

Lydia deals with being in the spotlight while working on a celebrity murder case; Sammy goes out on patrol; John and Ben are frustrated over a security detail.

Lydia and Josie investigate a complicated rape case on the Westside; John bonds with an abandoned teenager while also dealing with having to testify at his father's parole hearing.

John shares procedural tips with Ben, including how to make a death notification. Meanwhile, Lydia and Josie tangle with an unorthodox suspect in a drug-related murder case, and Sammy crashes at Nate's as he sorts through his marital issues