In a french lost village an old woman is killed and her savings stolen. Several members of her family, all called:"Goupi-…", are suspected.
There's a curse on the Malveneur family. There's a black legend which tells that one of their ancestors sold his soul to the devil and he was cursed: man by day, wolf by night.T hese doomed aristocrats were hunters,hence their name (Malveneur = evil venerer). The last of the Malveneur is a scientist who carries out strange experiments on …nobody knows exactly what the does in the subterranean.The wife has a heart condition, her sister-in-law is a masculine authoritarian lady. And nights in the old castle are not exactly peaceful.
Sara and Kurt Muller and their three children are returning to her mother's home in Washington DC after 18 years in Europe. A Romanian Count living there discovers Kurt's attache case full of money. He also finds out from friends at the German Embassy that Kurt is working with an anti-Nazi underground group in Germany. He tries to blackmail Kurt. Kurt shoots him and must flee. When Sara hears no more of Kurt, she knows that her oldest son Joshua will soon leave to work in the underground.