From the introduction:
[G]uests have been invited to an evening of gambling and entertainment at the Lady Lux, a casino owned by the wealthy Dona Mancini. The guest list includes a number of gambling enthusiasts—from high rollers to novices—as well as the performers, dealers, and other staff employed by Dona Mancini. Everyone is expecting an evening replete with games of chance, dinner, drinks, and maybe a show. [But] they aren’t expecting a power outage, the murder of a member of the surveillance team, or a lockdown that prevents them from leaving the casino.