Gang detectives Sammy and Nate have their work cut out for them when an unidentified female is found dead in the middle of a Los Angeles alley, her body being used for target practice by gang members. The tension mounts for Nate when his little sister disappears, revealing a secret from his past that blindsides Sammy. Meanwhile, Russell is offended by Lydia’s suggestion that he has been too personal during a consult with a victim’s sister.