Conan stumbles upon his creepiest mystery yet, complete with a haunted house, a spooky pair of twins, and...a giant spider? Are Conan and his friends really under attack by restless spirits, or was this web of terror spun by human hands? Good thing Harley Hartwell's there to help with the case! Then the Junior Detective League goes camping--only to run afoul of a gang of crooks, a labyrinth of caves, and a whole bunch of angry bats!