D.T. Matias

The hunt for a methodical killer takes the BAU to Arizona to search for an increasingly devolving UnSub, and the team speculates that Hotch is in the running to be the new BAU unit chief.

All eyes are on Mackenzie Allen as she hosts her first official summit with the Russian President - which is threatened to be overshadowed by Nathan Templeton's plan to engineer a series of cabinet resignations to coincide with the summit. Templeton goes after Mac with a vengeance, vowing to run - and win - against her in the next presidential election. Meanwhile, as First Gentleman, Rod must host his first state dinner for the Russian President and his wife.

Unable to recall any events from the previous night, the son of a hotel owner turns to Nick and Pete for help after he awakes to find a casino host strangled to death in a hot tub.