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SergeantVoighttriestofindoutwhoisbehindthemurderofJin,andcomeupwiththeunbelievablediscoveryandlearnedthatSergeantEdwinStillwellplayingadoublegamewiththeintentionofgettingoutonthesurfaceofthebigfishalongwithVoight.Inthemeantime,allmembersoftheintelligencedepartmentsreceivedeaththreatsfromanunknowngroupcalled"Shadow".AtseveralplacesinChicagoinafire,explosion,androbbery,forwhich"Shadow"takeresponsibility,bringingthecityintochaos.