Marc, a surgeon at a hospital, is murdered on December 31. When his ex-wife, best friend and a police lieutenant find themselves stuck in the same elevator, they emerge from it and realise they have moved a year back in time.

Summer 1996. Roma is seven years old and what she likes most is to make arrows with Louis, her older brother. Their mother, Florence, doesn't seem in a rush for their in-laws to join them in the Jura for a few days vacation. If we look closely, nor does little Roma. Why do we have a strange feeling of uneasiness hovering in the family home and that, between mistrust and denial, it is part and parcel of this normal vacation?