Desperate to change his life, 42-year-old Michael signs up to take part in clinical trials for a new anti-depressant. But when the tests are abandoned due to the discovery of serious side effects, Michael decides to continue the experiment on his own. Intoxicated by a new sense of self control, Michael feels an urge to take control of other people's lives as well. Slowly, his minor psychological games grow more drastic and frequent, until Michael makes a discovery that forces him to view his actions in a terrifying new light.