The corpse of the healer Rose Tournault has been found in her house and the police captain Anna Buisson will be in charge of the investigation.When she arrives at the house of the dead, she meets Eymeric Massoni who is looking at the corpse of his grandmother which is covered with white petals.Then he presents himself as the grandson of the victim and precises that the petals are those of the thorn apple (Datura stramonium).Some years ago a dam was build : a village and some hamlets were sunken and some families lost their houses. There is a legend of a white lady who goes around the lake.—zutterjp48