The LAPD interrupts the team’s Christmas celebration to arrest Mac for terrorism when they find a body in a building destroyed by a bomb Mac built.

Mac and Jack hit the road for a weekend of relaxation in Las Vegas, but their mini-vacation is cut short when someone from their past abducts them and locks them in a concrete room. Also, Matty tasks Riley, Bozer and Leanna with stealing a diamond encoded with terrorist intel from a princess in Milan.

With Mac and Riley undercover with Codex, hoping to stop the organization from within, their mission is interrupted when Russ, Desi and the Phoenix team move to prevent Codex from detonating a weapon of mass destruction, with Mac and Riley caught in the crosshairs. Also, the team discovers Russ’ real reason for purchasing the Phoenix Foundation.