The "tremendous popularity" (New York Times) of the Philo Vance series stems in part from author S.S. Van Dine's preference for ripping his plots from the headlines of the day. By the early '30s, when Casino came around, those headlines included some creepy chemical discoveries and scandalous doings at secret Manhattan gambling dens, where rich folks knocked back cocktails and played roulette, snickering at both the Depression and the Volsted Act. Philo, of course, is no stranger to cocktails or to snickering, and he knows more about creepy chemicals than the management at Dow. This comes in handy when the owners of a secret Manhattan gambling den are poisoned, perhaps by some new and creepy chemical. As deliciously, irritatingly erudite as ever, Philo is in his element here, solving what one reviewer called an "uncommonly subtle" crime.