法庭心理学家Sally Rowe被警方委派裁定是否有足够的证据以谋杀罪指控17岁的Alex,其被控告用枪射杀了同学Nigel。因为没有实物证据,案件的侦探备受来自有权势的Alex的父亲欲使监控流产的压力。深究 Alex和Nigel奇怪的共生契约,Rowe发现虽人已死,但Nigel的精神对Alex的影响绝没有减小。A forensic psychologist (Collette) is tasked with determining whether or not a minor should face murder charges for killing his schoolmate.