When murderous cult member "Baby" Jane Lee Rayburn is found stabbed to death, Detectives Rex Winters and Tomas "TJ" Jaruszalski question multiple suspects, including the cult ringleader Denis Watson and Jane's former cellmate, Maura Dillon. However, the case cuts very close to home for Detective Winters when his wife Lori, a former Detective, is questioned. DDA Dekker and DDA Stanton find themselves facing a trial where the line between suspect and victim is blurred.

When a normal quinceañera erupts in violence, leaving multiple people dead, the detectives work quickly to follow a lead. During their search for answers, they find a young boy protecting acres of marijuana and discover he is the only witness that can help the case. As the detectives begin to close in on a suspect, Winters receives a surprise visit at home. Meanwhile, DDA Morales (Alfred Molina) must risk upsetting the Mexican government by prosecuting the guilty, which results in a shocking decision.

When a crazed gunman open fires during a rally with State Senator Celeste Kelman, seven innocent people are killed including the Senator. With the help of modern technology, the detectives identify a solid lead and possible motive for the shooting. At the DDA's office, tensions are running high when Dekker and Rubirosa disagree on how to handle the case. Meanwhile, TJ gets himself into a sticky situation as he continues his quest to find his dead partner's killer.