The Room of Death: the Noricin Chronicles: Chronicle the First Part 3:

After another short summer reprieve, Dan's classmates return to Snisnar to face their darkest year at school yet. The Scorpion is still at large, and now the students of Snisnar are disappearing at an alarming rate. Worst of all, Dan is the prime suspect for the mysterious kidnappings. As the school's faculty suffers strain from within, Dan finds himself in a race against time to find out who the Scorpion has currently possessed, and what he is planning to do with the kidnapped students. Will Dan be able to solve the mystery before it's too late to save the missing students?