围攻，一部传世的动作片，Walker,aninternationalassassin/hitman,iscompromisedduringamission.HishandlersendshimtoaReassignmentCenteratwhichWalkerwillbeprocessedforanewidentity.Duringhisstayatthefacility,aruthlessassaultteamstormsthecompoundsearchingforsomeonetheirbosshaslost.WalkerbegrudginglyfallsinwithElda,askilledhitwoman,andJuliet,hermysteriousward,inordertomaximizethechancetosurvivethenight.