Summer time means camping time. Tina is already looking forward to the summer camp that will take place in Falkenstein. It's even better that she can also get her friend Bibi excited about it. Numerous students from an international school in Berlin will participate. The highlight is a geocaching challenge - a modern treasure hunt where boys and girls compete against each other. To win, the ambitious Urs is willing to use any dirty trick. Bibi, in particular, is determined not to let that happen, but at a crucial moment, she suddenly loses her witch powers.