The Famous painting of the Mona Lisa gets stolen by Big Boss to start his own stolen art collection.

Bulletproof had to go away. So he puts Sundown in charge of the entire C.O.P.S. team, who has a very low approval rating for Sundown's leadership.

Sundown, while suffering from amnesia after being knocked out by a fallen lamp post, unwittingly teaches Big Boss' Crooks all the tricks and traits of what it's like to be a cowboy, not knowing that this is part of Big Boss' plot to use Sundown as a pawn to commit an armored truck robbery. Sundown later regains his memory and helps the C.O.P.S. team put a stop to the heist and nab the rustlers along the way.