Klara and Wolle are horrified: The beautiful old weeping willow, their favorite tree in the schoolyard, is set to be cut down. The two friends do everything they can to prevent the tree removal, but their classmates show little interest in their efforts. Fortunately, Milla appears, the new classmate with a wild red hairstyle. Together, the three of them come up with a daring rescue plan. However, it seems that Milla has a secret. Since she joined the class, strange things have been happening. A book about friendship and the relationship with nature, wrapped in an exciting mystery and sprinkled with a touch of magic.