The three ghoulfriends - Robecca Steam, Venus McFlytrap, and Rochelle Goyle - are on the case to solve the mystery of the missing headmistress! First up is investigating the creeperiffic attic on the Monster High campus, where someone appears to have been hiding out amongst the lacy webs. Who is she, and what's her secret? The ghoulfriends soon find out and uncover a much bigger plot that puts the future of the entire student body in danger . . .