One Christmas morning, four cousins meet to go and play in their grandmothers house. First, they play in the attic, then in the garden, until one of them suggests that they go for a stroll. But how far will they go? Their walk takes them into the woods, but not just any woods: the enchanting and mysterious woods of the Mullerthal. As they venture further and further into the woods, they start to wonder whether they will be able to find their way back home