At the riding school of Franzi's new classmate Fiona, strange things are happening. Eventually, Fiona's favorite pony Tinka goes missing. The trail leads the three of them to the rival's farm. Will they find the pony there? Or is there perhaps more to Tinka's disappearance than Kim, Franzi, and Marie had thought? Alongside the thrilling detective work, Kim, Franziska, and Marie must also navigate the adventure of 'friendship.' It’s not easy to reconcile three completely different opinions. Brave and clever, 'The three' take on the challenge and together form an unbeatable team!.