Nikolaj Arcel's sweeping costume drama “A Royal Affair”—Denmark's Oscar entry—follows the struggles of young Queen Caroline (Alicia Vikander) as she tries to adapt to her new role as wife of Denmark's obviously insane King Christian VII (Mikkel Boe Folsgaard). The year is 1766, and Caroline, a native Brit, is forced to make do with her unpredictable husband and strange new surroundings with hardly any friendship or encouragement