The Snoops and The Phantom Postbox. Series 1, #3

A missing compass. A thirteenth chime. And a mystery buried beneath Maplebeck Primary.Katie, Ben, and Ella never expected their ordinary school sleepover to turn into the strangest night of their lives. But when the long-silent clocktower rings thirteen times, a chain of events begins - one that pulls the three Snoops into a web of hidden rooms, coded symbols, and a secret someone tried very hard to bury.
The discovery of a strange wooden box leads them deep into the school's forgotten tunnels, where old maps, cryptic messages, and a cracked compass reveal clues left behind by a boy who vanished decades ago. As the Snoops follow Isaac Marsh's trail, they uncover something watching the halls. something known only as The Warden. With danger around every corner and the truth twisting deeper underground, the Snoops must rely on courage, teamwork, and every detective skill they've ever learned to solve their biggest mystery yet.
Perfect for fans of enigma-filled school mysteries, secret tunnels, and fast-paced junior detective adventures, The Snoops and the Midnight Compass is the third thrilling instalment in A. J. Bolster's middle-grade mystery series. Do you dare follow the compass into the dark?