The must-read middle-grade novel from the author of super-spooky Crater Lake. Perfect for 9+ fans of R.L.Stine's Goosebumps. "Deliciously scary and hilarious comedy-horror, perfectly pitched for eight-plus." The Guardian "Brilliantly creepy fun for young horror fans, with an unexpectedly moving ending." The i, 30 of the best children's books for Easter. "Jennifer Killick's talent for horror and humour is blended brilliantly here as the spiky dialogue, unstoppable pace and genuinely menacing atmosphere build to a tremendous climax"- Daily Mail "A heart-stopping thrill ride of a book." - M.G. Leonard, author of Adventures on Trains series "BRILLIANT!" - Vashti Hardy, author of Brightstorm WINNER of the Young Reader category in the Children's Literature Festivals Book Awards 2023!It's basically the worst school detention ever. When classmates (but not mate-mates) Hallie, Angelo, Gustav and Naira are forced to come to school on a SATURDAY, they think things can't get much worse. But they're wrong. Things are about to get seriously scary.What has dragged their teacher underground? Why do the creepy caretakers keeping humming the tune to Itsy Bitsy Spider? And what horrors lurk in the shadows, getting stronger and meaner every minute ...? Cut off from help and in danger each time they touch the ground, the gang's only hope is to work together. But it's no coincidence that they're all there on detention. Someone has been watching and plotting and is out for revenge ...