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TheeighthseasonoftheBritishspyseries"MI-5,"whichfollowssecretagentsastheyfoilevilplotsaroundtheglobe,beginswiththefalloutfromHarry’skidnappingbytheRussians.Amysteriousorganizationknownonlyas"Nightingale"istheongoingfocusoftheeightepisodes.AndLucas’relationshipwithCIAagentSarahCaulfied(GenevieveO’Reilly),reignitesconcernsoverhisloyalty.Thisseasonalsoseestheexitofoneofthefeworiginalcastmembers,MalcolmWynn-Jones.