In the season finale of 1923, Spencer and Alexandra board a ship for passage to America but encounter her former fiancé, Arthur. He challenges Spencer to a duel, which ends in Arthur being tossed overboard by Spencer. Both are confined, but after defending himself, Spencer is deemed innocent.
However, Arthur Sr. insists on Spencer being put ashore, separating the newlyweds. It's implied that Alex may be pregnant as she experiences sickness on the ship, leaving viewers wondering if she is carrying Spencer's child. The twist ending leaves the future of their relationship uncertain.