Les galapiats (1970)

In Stavelot (Liège, Belgium), and the surrounding areas, a group of teenagers is about to be dragged into a thrilling and mysterious adventure. Four Belgian boys, one Frenchman, one German, and a pretty Canadian girl on vacation, are hunting, like a game, for the treasure lost by the Templars, but soon find themselves involved in mysterious inexplicable events. In the silence of the Hautes Fagnes, in fact, impressive and sinister ruins of the unnamed Castle rise. Around this historical relic that dates back to the feudal times, the boys will make continuous and surprising discoveries, increasingly inexplicable, in caves and underground. But everything is so disturbing and it is not clear what actually lies in the castle. Finally the young scouts with courage, cunning and audacity will help the police solve the mystery. The story is inspired by a similar fact that happened in those years in Belgium.