In,season,six,of,the,British,espionage,thriller,,the,team,are,pushed,to,their,limits,,as,the,relationship,between,British,and,American,security,deteriorates,and,loyalties,change.,Adam,and,Ros,fight,against,an,emerging,terrorist,threat,,and,a,deadly,virus,that,could,decimate,London.,This,season,breaks,away,from,the,case-by-case,episodic,format,,with,one,dominant,storyline,tying,all,the,action,together.
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