Mason Green returned from a fun summer vacation with his friends only to find himself in second grade with a new, scary teacher named Mr. Cromwell. To add to the stress, he goes to visit his sister Lindsey, who tells him that something is coming for him. Not knowing whether to believe her, Mason struggles with anxieties made worse by Mr. Cromwell's harsh teaching. He soon realizes what Lindsey told him may not be just another hallucination when something taps at his window each night.
Is the monster real? What is it, and what does it want with Mason and his friends?
Read on to find out the nature of the beast as we cross the border between fantasy and reality.