HavingwokenupinHongKong,withnomemoryforthelasttwoyears(!),SydneyreturnstoLosAngelestotrytopiecetogetherthelasttwoyearsofherlifeanddiscoversthefatesofherfriendsandfamily:Vaughnha求爱arriedthinkingthatSydneywaslongdead;MarshallishavingababywithCIAtechexpertCarrieBowman;andDixonisnowthenewdivisionheadoftheL.A.officebranchoftheCIA.SydneyalsolearnstheshockingfatesofJackandSloane;theformerisinCIAcustodyforcommunicatingwithIrinawhomstillisinhiding,whilethelatterislivinginSwitzerlandunderhousearrestinexchangeforco-operationwiththeCIA.SydneyisgrantedtemporaryCIAclearanceonacasethatmayhelpherregainhermemoryandshemeetsanewenemygroupcalledTheCovenant.