Summary: Norah, Audrey, Basile, and Alex experience a day full of adventure and mystery. The four teenagers participate in a class-organized trail run in the ancient forest of Broceliande. However, things take a turn when Audrey is bitten by a snake. Fortunately, she is saved in time by none other than the legendary wizard Merlin. This unexpected turn of events transforms their athletic challenge into an enchanting journey full of legends and magic.