In two separate incidents, an unsub has raped and/or killed in Los Angeles, California. The first victims, two females, were raped, tortured then killed in the downtown area. Three days later in the suburbs, a woman, in her home, was raped repeatedly in front of her husband, the latter who was ultimately killed. The wife was purposefully kept alive. These incidents have taken place in the area of the city where the rolling blackouts have occurred that evening, the blackouts to combat the excessive power use due to the heatwave. Garcia determines that the unsub has been at work for at least twenty-six years - raping and murdering during blackouts - the individual incidents never having been connected since he has never killed in the same city consecutively until now. In speaking to the detectives in charge, the BAU make a connection to one of the first killings as the reason the unsub has returned to Los Angeles. From there, the BAU think they know who the next target will be. They have to rush to reach the target before the unsub does.