When Pete, Nancy and Krish arrive at Heathland Camp for a school trip, they're in for an adventure - just not the kind they were expecting. Nearby sits the abandoned Harwood Institute. The crumbling buildings reek of secrets and, at night, strange screams come from the surrounding forest. Nobody knows what experiments took place at the institute during the war, so Pete and his friends make it their mission to find out. But the forest is hiding a sinister secret, and the trio could be in real danger. Are some mysteries best left undisturbed?