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Mona Lisa rescues Bart from being an indentured servant, after Bart loses a high stakes poker game between nouveau riche art collectors. Oily backer Roger (Jack Cassidy) brought Bart into the game as a "Colonel," but when Bart loses, Roger denies the scheme, so Bart must work off the debt to the winner, a railroad tycoon. The other art collectors are big investors in the tycoon's latest rail project, and they are squeezing him dry, though the tycoon has a priceless ace he's reluctant to take out of the hole: he's acquired the recently-stolen Mona Lisa ! The miffed Roger's a very sore loser, so he enlists the Barbary Coast's fearsome Captain Bly versus Bart Maverick.