"What's at play there is somebody who's really in an existential crisis," Spector says of George in the season finale.

After a tense and dramatic third season, HBO ’s hit period drama, which follows New York City ’s high society in the 1800s, ended Sunday with railroad tycoon George Russell (Morgan Spector) walking out on his wife, Bertha Russell ( Carrie Coon ).

Fellowes quoted his own creation, Downton Abbey ‘s formidable Violet Crawley (Maggie Smith), who told her son that their set doesn’t divorce. Rather, she says, “In that case, the couple are unable to see as much of each other as they would like.”