A racehorse that refuses to run

How to make a racehorse run?

No, that's not the beginning of a joke. For ten-year-old Kaya, on the other hand, it's a very serious matter. She accidentally bought a racehorse. His name is Noble Warrior and he is as fast as the wind, but he simply refuses to run unless his best friend, the mischievous pony Percy, is with him.

Kaja has to exert all her strength to make her racehorse run. He's got to win the derby. Why is this so important? Because if she fails, her family will lose not only both horses, but all the other animals and the whole farm. Will Kaya manage to save her home and her friends?