Conniving old Poker Face is up to more of his dirty tricks. He has pulled some strings in Washington so that the Tribe of the Upright Men may be granted a license for gambling. Ignoring the advice of his good friend Lucky Luke, Chief Earnest Eagle accepts the dubious proposition in exchange for a meager stipend...drinking water! While Poker Face fills his pockets with filthy lucre, easy water turns all the Upright braves into spoiled little papooses! Full of remorse, Earnest Eagle calls to the rescue his brother Luke-the-pure-hearted. Nothing is more shameful to an Upright Man than to be downright irresponsible!