Harry Poole, an introverted young man, suffers from bipolar disorder. He enrolls in a clinical trial run by the famous Dr. Lanyon, whose miracle drug is destined to help people like him lead a more balanced life. Under constant video surveillance, Harry quickly experiences positive results and turns into a new man, more charismatic and charming. He even manages to seduce Anna, a young nurse who looks after him. Harry, fully embracing his rebirth, creates a new personality for himself. "Edward Grey" is born, the man he has always wanted to be: outgoing, bold and fearless. Unfortunately, the doctor abruptly discontinues the clinical trial. Cases of rage and confusion have been reported among other test subjects and the medication is pulled. Anna, taking pity, gives Harry a parting gift: a large supply of the pills, with which he continues his own "trial" at home. Intoxicated by the freedom and power of his new identity as "Edward"...

在白天 Yan Lazarrec是一个性格温和，规矩本份的药剂师，但是在晚上，他却残酷的杀害那些污染环境，危害公众健康的人带有讽刺性地并且为每个人设计不同的死法。一个警察经过追查，慢慢把疑点集中到Yan身上……