In the fourth season, Sisi challenges the best jockey in Bavaria to a grand horse race to save the family’s estate, Castle Possenhofen, after the death of her father. Back in her homeland, she comes across dark family secrets and ultimately must ask herself where she really feels at home(曾经也以为，人是渐渐变老的，后来才知道，人是一瞬间衰老的)