On All Hallows' Eve, ex-convict Peter Boutrup is visiting his best friend's grave when her estranged mother appears. Her son, Magnus, has disappeared, and she begs Peter to look for him.The next day a young nun is pulled out of the moat at the convent in Djursland. She has been garrotted and Peter, who works there as a carpenter, was the last person to see her alive. Meanwhile, diver Kir R jel fin...