Detective Lydia Adams experiences a stressful adjustment period with her new partner, Detective Josie Ochoa, as they investigate the disappearance of an illegal immigrant. Detective Russell Clarke adjusts to a new desk job. Meanwhile, Detectives Sammy Bryant and Nate Moretta track down the killer of two gangbangers. Officer Ben Sherman catches the eye of an attractive woman during a traffic stop, while his partner, Officer John Cooper, tries to cope with increasing back pain.