On this eve of France’s Independence Day, 1957, the exploration of a mysterious subterranean passage will dramatically change the lives of three young children. Zan, son of Big Marcel, has asked Tipol, Belette and their sisters to meet him at the old cemetery of St-Maurice-sur-Moselle. On the surface, this summer seems like any other. The group plays Cowboys and Indians, chases after a train, goes trout fishing, and builds forts. Yet the dark side of summer soon bursts forth: criminal arson, thwarted love, the disappearance of a corpse, a sinister plot. Jump to the year 2004. A struggle leads to the violent deaths of a group of construction workers demolishing the old Baillon house. Nothing can explain the madness that ensues. Nothing… except perhaps the story of what happened to the children all those years ago…

Set in France’s ancient countryside, along the Vosges riverbanks, Méchamment Dimanche is an extraordinary coming-of-age tale -- somewhere between Lord of the Flies, The Little Friend and Mystic River.