From the very first day that Martine and her children arrive to spend the summer at her family house, by a lake in the French countryside, they begin to feel uneasy. Even the crows seem to be disturbed. The electricity fails, candles refuse to stay alight and stormy weather threatens. It seems that Nature is conspiring to tell them something that they cannot at first understand. A surprise meeting with an old schoolfriend in the village results in an invitation, and an unresolved mystery from five hundred years ago starts to unravel. A serving girl from the old chateau, which now lies in ruins, long ago drowned in the lake, and her spirit haunts the area. With the discovery of an ancient document and a long-lost necklace, her descendants are finally able to accept the past, with the assistance of a herbalist and a mystic. The practice of dowsing the local energies leads to resolution and a new beginning for them all. Village harmony is restored.