In the extremely popular series about Manege de Zonnehoeve, each book is about a different pony. In this latest part we read Kareltje's story. He really wants to race, but is only allowed to be the companion pony of real racing horses, like his best friend Millard. Until his owner Jan discovers how fast Kareltje can run. He can participate in pony races! Thanks to the training with the big horses, he is getting faster and faster. But then Jan gets sick. The racing stable is suddenly in danger of having to be sold... What will happen to Kareltje now? In the extremely popular series about Manege de Zonnehoeve, each book is about a different pony. In this latest part we read Kareltje's story. He really wants to race, but is only allowed to be the companion pony of real racing horses, like his best friend Millard. Until his owner Jan discovers how fast Kareltje can run. He can participate in pony races! Thanks to the training with the big horses, he is getting faster and faster. But then Jan gets sick. The racing stable is suddenly in danger of having to be sold... What will happen to Kareltje now?