A gentleman's club in Mayfair next door to the Duke of Snodgrove's town house that catered to intellectuals, philosophers, and scientists. By the end of Soulless, it was discovered that the members of the Hypocras Club were kidnapping and experimenting on vampires, werewolves, and other supernatural creatures. Alexia later discovered that the club was a militant off-shoot of the Order of the Brass Octopus.