Nine years after her son is killed in a road accident, Marie-France poses as the killer's assistant and gets herself involved in his life to seek revenge from him and his family.

As he is driving his wife to the maternity ward, Thomas runs over and kills a young man on the road. Marie-France, the mother, will not get over the mourning of her lost son. Nine years have passed. Marie-France has become Thomas' secretary and dangerously starts to interfere into his life, with one idea in mind: to get closer to his son...—Tarantula