"If he isn't back by 8:00 pm, we'll call the police." Bo's school trip is heading for a bad end. One of his classmates has disappeared without a trace! The police start searching with the K9 squad and helicopters - in vain. A tire mark in the woods brings Bo and his friends YoYo, Simon and MM on the right track. But the adventure soon turns into a nightmare. Their missing classmate is not the only victim that an unscrupulous gang has it in for…