Sergeant Voight tries to find out who is behind the murder of Jin, and come up with the unbelievable discovery and learned that Sergeant Edwin Stillwell playing a double game with the intention of get

芝加哥警局21区小分队分红两个不同的小组 一组穿着警服在街上巡查并担任街头立功，另一组为重案组，专门担任大案要案，如有组织立功、贩毒、谋杀等 重案组头头是警司Hank Voight，为了伸张正义，有时他也不会遵照法律顺序。只要受得了这位严苛下属的人才干在他手下任务。警官Antonio Dawson跟Hank合不来，而且前者也想当老大，所以每天他都跟Hank对着干。