Bibi Blocksberg is a girl with special powers: she is a witch. With her best friend Tina brings her summer holidays at the riding school. Together the girls are riding every day. But this summer there are quite a few problems. Such is the beautiful but unreliable Sophia. She is behind Tina's boyfriend Alexander. She tries to get him to go with her to boarding school in England. Tina is completely overwrought. And if that was not bad enough, the wily businessman Hans Kakmann doing its utmost to Alexander's father to extort the colt Socrates. On the day of the great horse race at the castle Bibi knows not what to do and who they should stand up. Not only Socrates is at stake, but also her friendship with Tina.