In Jim Butcher's second Dresden Files novel, 'Fool Moon,' Chicago's only professional wizard, Harry Dresden, finds himself entangled in a brutal case involving werewolves. When two gang members are gruesomely murdered, seemingly by a creature of immense strength, Harry is hired by the police to investigate the supernatural angle. However, he soon discovers that multiple factions of lycanthropes are involved, each with their own agendas and dangerous secrets. As the full moon approaches, Harry must navigate a treacherous web of ancient magic, dark conspiracies, and deadly transformations, all while trying to protect innocent lives and avoid becoming the next victim himself. This thrilling urban fantasy blends hard-boiled detective noir with magical action, offering a compelling look into the shadowy underworld of Chicago where monsters are real and magic is a weapon.