The BAU zeroes in on a twisted UnSub in D.C. destroying hisvictims by spraying and submerging them in acid. Prentiss andRossi dive into the BAU's history to see how they are connectedto Gold Star. They soon discover that the only backup filesavailable belong to the wife of a former BAU member. Prentissgoes to her to uncover the truth. Voit utilizes his lawyer toreach out to Damien and gain footing against the BAU.