 Faithful adaptation of Peyo (qv)s 9th comic album (graphic novel)  starring Johan & Pirlouit: "La Flûte à 6 schtroumpfs", featuring  some background cameos from characters used in two other albums.  The traveling performers at the start of the movie are from book 12:  "Le Pays Maudit", while the dog howling in the rain and the two  people coming out of the jewelers shop appeared in book 13: "Le  Sortilège de Maltrochu".