TheeighthseasonoftheBritishs yseries"MI-5,"whichfollowssecretagentsastheyfoilevil lotsaroundtheglobe,beginswiththefalloutfromHarry’skidna ingbytheRussians.Amysteriousorganizationknownonlyas"Nightingale"istheongoingfocusoftheeighte isodes.AndLucas’relationshi withCIAagentSarahCaulfied(GenevieveO’Reilly),reignitesconcernsoverhisloyalty.Thisseasonalsoseestheexitofoneofthefeworiginalcastmembers,MalcolmWynn-Jones