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
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