Madhouse is a novel by Rob Thurman, the third in her Cal Leandros Series, after Nightlife and Moonshine. Its plot centers around the vicious Sawney Beane, who has mysteriously come back from the dead, and is killing innocent New Yorkers. This book is notable in that is introduces several new characters, including Ishiah the Peri, Delilah the Werewolf and Wahanket the Mummy, on top of its usual cast.