The Angel Tree by Daphne Benedis-Grab (author) (US edition)

The cover art alone fills us with festive spirit. Wishes, friendship and a Christmas mystery. Get ready to feel all warm and fuzzy inside. In the small town of Pine River, a tree appears in the town square every Christmas: the Angel Tree. Some people tie wishes to the tree, while others make those wishes come true. Nobody’s ever known where the tree comes from, but that’s always been part of its charm. But this year, four friends have decided to solve the mystery. Can they track down Pine River’s guardian angel, and finally thank the person who brought the Angel Tree to their town?