Bibi Blocksberg visits her friend Tina Martin at the riding stables during the summer vacation. This year there is to be a special horse race organized by Count Falko. However, the two friends run into trouble when Sophia von Gelenberg from an elite boarding school at Falkenstein Castle, a participant and close acquaintance of the house, arrives and tries to steal Tina's boyfriend Alexander. The shady businessman Hans Kakmann is also up to no good, and it's not just the foal Socrates, known as "Socke", he's after. Bibi tries to save Alex and Tina's relationship on the one hand and expose Kakmann's business practices on the other. But even witchcraft can't prevent her from turning everyone against her, Count Falko enrolling his son in boarding school and Kakman offering to buy the foal "Socke".

When robbers hit Falkenstein castle, teen witch Bibi and pal Tina hunt for the crooks, then devise a plan to save the neighbors' failing ranch.

It's perfect pandemonium when Bibi and Tina meet a runaway boy with an attitude problem, who turns out to actually be a girl, named Adea. Adea‘s uncle is so narrow-minded and stubborn that even with all her magic spells, Bibi can't manage to get the two to reconcile. Meanwhile, Falkenstein Castle is being renovated, which is driving the Count to his wits' end. Especially since Alex is planning to hold a music festival at Falkenstein and is determined to go through with it over his father's objections. And if all that was not enough, Tina gets kidnapped. Despite the complete chaos, one thing is clear - in the end, real change comes from everybody working and pulling together, not by magic.