Summer vacation. Mika is overjoyed to see Ostwind again. But then she discovers strange wounds on the belly of Ostwind, for which no one has an explanation. Yet this is Kaltenbach verge of bankruptcy!

Together with the boy Carlo and their faithful friend, the horse Ostwind, they try to save Orkan from the cruel owner of a traveling circus. However, the shrewd director unravels their audacious plan.