A man finds out from a would be killer that his wife has paid $10,000 to have him killed. But is this mysterious man telling the truth When both the killer and the wife turn up dead, everyone is a suspect, and the investigation takes an unexpected turn

Allan自一场意外事故后沦为自暴自弃的神经机能发生障碍者，友人致力于动物智力开发研究，并将一研究对象Ella，一只聪明的猴子赠予Allan，聪明的Ella肩负起起Allan的生活起居。但好景不长，猴子Ella开始显露出强烈的控制欲和疯狂的报复心，甚至伤害了Allan至亲的人。最后，Allan又能否走出这一困境呢