The third season opens with a 3:00am roll-out that sends the PHD to the scene of the brutal triple murder of a couple and their preteen daughter. As the team processes the crime scene, they discovery the couple's teenaged son, Eric, still alive and on drugs in the attic. At first Eric seems to be their likely suspect but, as the investigation proceeds, the dead man's mysterious business partner, a psychologist named Dr. Reichter and his connection to Eric's father may hold the key.
Meanwhile, a financial crisis in the LAPD forces Brenda to face the loss of a detective. At home, Fritz tires of having no place for his belongings and decides he and Brenda should get a bigger house. When Brenda resists, he finds a creative way to make his point.