Guest Stars William Ludwig as Willem Smit Nicole Forester as Marian Watts T.J. Ramini as Mark Levinson Deidrie Henry as U.S. Ambassador to Germany Amy Schwartz Matt Corboy as Gabriel Watts Chris Rogers as Senior Chief Inspector Leon Honsel Carlotta Banat as Tanja Kessler Co Starring Marcus Ho as U.S. Ambassador to Hungary Frank DeLillo Damian Schedler Cruz as Noah Bergen Annabelle Mandeng as Ilse Hahn Milo Callaghan as Thomas Watts Raphael Zari as Finn Mueller