خلاصه داستان : میکا در تابستان به مزرعه بازمی‌گردد و یک اسب سفید وحشی که به نظر او یک "تک‌شاخ" است را در جنگل پیدا می‌کند. او با یک جوان مرموز که قصد رام کردن این حیوان را دارد، معامله می‌کند...

Summer vacation. Mika is overjoyed to see Windstorm again. But then she discovers strange wounds on the belly of Windstorm, for which no one has an explanation. Yet this is Kaltenbach verge of bankruptcy! With a heavy heart Mika decides to participate in a variety tournament in which beckons a high prize money. But during training affects Windstorm distracted, often he runs away easily. Mika pursued the black stallion until deep into the forest and is quite surprised: From the thicket a seemingly magical gray mare appears and the two horses dance around lovingly. Suddenly, a strange boy named Milan appears, who says the mare had escaped him. He claimed that he could Help Mika to win the tournament. But is there still time to save Kaltenbach?