Inthefourthseason,awomanisfoundbrutallymurderedonasmallartificialDanishislandclosetothe?resundBridge.ThewomanisMargretheThormod,Thormod,DirectorGeneraloftheMigrationAgencyinCopenhagen,whowasrecentlyembroiledinadeportationscandal.DanishdetectiveHenrikbeginstoinvestigatethemurderwithouttheinvolvementofSaga,duetothefactthatshehasnowbeenimprisonedforthemurderofhermother.Henrikismissinghiscolleagueandwantstovisitherasoftenaspossiblesoshecanhelpwiththecase.However,herpredicamentrendersherunabletohelp.Henrik’ssearchforhismissingdaughtersisalsofrustratedbySaga’simprisonmentandhegetsclosetogivingup.