Elsa Keslassy International CorrespondentIn the run up to Series Mania, European network Arte and German public broadcaster NDR have boarded “Helsinki Syndrome,” a contemporary Nordic Noir thriller series headlined by “Vikings” star Peter Franzén and created by Mikko Oikkonen (“Bordertown”). “Helsinki Syndrome” is the first series jointly produced by Beta Film and leading Finnish production banner Fisher King which is part of the Beta Nordic Entertainment Group.