The bureau had had problems catching a new unsub, who in addition to being a murderer, was also responsible for million-dollar robberies in casinos and banks. On this occasion, the BAU decided to go a little further with the case, so they decided to take a risk in that Las Vegas casino.

Spencer was chosen as a covert target to catch the unsub. He just had to pretend to be another millionaire in that casino and catch the thief who cost them so much to put behind bars.