On Jonathan's 7th birthday, he witnessed a violent act toward his mother that triggered a mental collapse. He was found days later by his aunt, Mary. The boy was dressed like a clown, siting alone in his home with the corpses of his mother and her lover. After ten years in a mental health facility, Jonathan is coming home to join the only family he has left. Mary hopes he can live a normal life, but on the eve of his seventeenth birthday, things begin to get wicked, as Jonathan's imaginary friend decides to come out and play.