Somewhere beneath the cracked sidewalks of downtown Las Vegas, past the tourist traps and the pawn shops and the casinos that swallowed a thousand fortunes before breakfast, there is a place that the mob spent fifty years pretending does not exist. Not a rumor. Not a legend. A place with walls, with tables, with electricity running through it — a fully operational underground casino that processed more money in a single weekend than most legitimate businesses saw in a decade, and when the people who built it needed it to disappear, it disappeared so completely that almost nobody who goes looking for it ever finds it.