SergeantVoighttriestofindoutwhoisbehindthemurderofJin,andcomeupwiththeunbelievablediscoveryandlearnedthatSergeantEdwinStillwellplayingadoublegamewiththeintentionofgettingoutonthesurfaceofthebigfishalongwithVoight.Inthemeantime,allmembersoftheintelligencedepartmentsreceivedeaththreatsfromanunknowngroupcalled"Shadow".AtseveralplacesinChicagoinafire,explosion,androbbery,forwhich"Shadow"takeresponsibility,bringingthecityintochaos.《芝加哥警署第二季》采用了严谨的故事逻辑和纯粹而又充满激情的表演方式,《芝加哥警署第二季》的风格明亮,剧中造型美感十足,表现手法不多见,该剧大打纯情路线,充满校服、军训、球场等高中生活元素,而其中也穿插了80后的年代记忆。