Antoinette, a school teacher, is looking forward to her long planned summer holidays with her secret lover Vladimir, the father of one of her pupils. When learning that Vladimir cannot come because his wife organized a surprise trekking holiday in the Cévennes National Park with their daughter and a donkey to carry their load, Antoinette decides to follow their track, by herself, with Patrick, a protective donkey.

Following the disappearance of the glamorous and secretive Evelyne Ducat during a blizzard in the highlands of southern France, the lives of five people inextricably linked to Evelyne are brought together to devastating effect as the local police investigate the case.

When the mother of two adoptees is tipped off about the possible affair her husband may be having with one of their children, her sense of duty takes a macabre turn.