There’s a point in most long-running serialized dramas where the writers are stretching to find some new external pressure to put on its central characters. Maybe this necessitates a location change. Maybe you get a recognizable actor to play the Big Bad for a season. Or maybe you just keep doing the same thing over and over again and hope no one will notice. With the third season of the Netflix original series Ozark, however, the conflict is turned inward. Season 1 began as the story of a man forcing his family on the run while telling them …