Alissa Simon Film CriticFascinating backroom politics circa WWII are undermined by banal marital melodrama in Danish director Christina Rosendahl’s “The Good Traitor,” resulting in a so-so period drama that raises more questions than it answers. The film centers on the life of diplomat-gone-rogue Henrik Kauffmann (Ulrich Thomsen, stoic), who was posted to Washington, D.C., as Danish Ambassador in 1939.