A teacher lives a lonely life, all the while struggling over his son’s custody. His life slowly gets better as he finds love and receives good news from his son, but his new luck is about to be brutally shattered by an innocent little lie.

Michael needs a change in his life, so when he hears about clinical trials for a new anti-depressant, he signs up to be a guinea pig - without telling his family. Because of dangerous side effects, the trial is subsequently abandoned but Michael continues to take the pills. Having lost all control, Michael's repressed instincts resurface with a force and violence that no-one could have predicted.