Detective Lydia Adams (Regina King) endures a stressful adjustment period with her new partner, Josie Ochoa (Jenny Gago), as they investigate the disappearance of an illegal immigrant. Detective Russell Clarke (Tom Everett Scott), Lydia’s former partner, adjusts to a new desk job on the force. Meanwhile, Detectives Sammy Bryant (Shawn Hatosy) and Nate Moretta (Kevin Alejandro) look for the killer of two gangbangers and Officer Ben Sherman (Ben McKenzie) catches the eye of an attractive woman during a traffic stop, while his partner, John Cooper (Michael Cudlitz), struggles with increasing pain.