InseasonsixoftheBritishes ionagethriller,theteamare ushedtotheirlimits,astherelationshi betweenBritishandAmericansecuritydeterioratesandloyaltieschange.AdamandRosfightagainstanemergingterroristthreat,andadeadlyvirusthatcoulddecimateLondon.Thisseasonbreaksawayfromthecase-by-casee isodicformat,withonedominantstorylinetyingalltheactiontogether