The genius inventor pig Albert Einswein has with his super seed the solution for Cattle Hill, which is struggling with supplies. The seed is mysteriously stolen when it is transported on the new hyper-modern railway - but by whom? On the train, Klara and Gaute meet master detective Agatha Christensen and together they must solve the mystery to save Cattle Hill.
Kutoppen - På sporet, Mystery on the Cattle Hill Express, A Mystery on the Cattle Hill Express, Klara Ko och tågmysteriet, Klara y el misterio de las semillas mágicas, La Klara i el misteri de les llavors màgiques, Müsteerium Veisemäe kiirrongil, Mystère sur la colline aux gâteaux, Neşeli Çiftlik: Tren Kalkıyor!, The Mystery on the Cattle Hill Express, Uma Aventura no Expresso Cattle Hill, Zagadka Klary Muu, Μυστήριο στη φάρμα των ζώων, Детективи звіропоїзда