The 1995 case involving two teenage boys who committed suicide after going on a murderous rampage at the local mall is re-opened when evidence shows there may have been a third shooter.

When a video tape of the shooting is discovered hidden in an air vent in the mall, Lilly and the team see that the third shooter managed to leave the crime scene pretending to be a survivor. Now, Lilly and the team must retrace the lives of the teenage boys and the events that led up to that fateful day, and re-interview all of the survivors.