Karolin, Chris and Philipp: they are not just best friends, they are Die Pferdebande ("The Horse Club"). They ride, they jump and they are kid detectives. Their newest case is about a sabotage at the casting for the world famous horse show "Arena Caballo". Anne, a friend of theirs, is participating in this casting. She seems most likely to win. But then something happens. Lajana, Anne's horse, shies unexpectedly and she is very badly hurt. Is her dream to be a famous actress meant to be over? Was it an accident .. or was it sabotage? A new adventure begins for the horse gang.