Two grandes dames of the French cinema face off in this psychological thriller when a grieving mother (Emmanuelle Devos) tracks down the aging beautician (Nathalie Baye) who may have killed the former’s teenage son in a hit-and-run accident. The premise is hardly fresh, but screenwriters Antonin Martin-Hilbert and Frédéric Mermoud tease it out so gradually that you may find yourself hooked anyway. The mother takes a two-pronged approach to her pursuit, posing as a customer to strike up a friendship with the beautician even as she negotiates privately with the woman’s husband (David Clavel) for the purchase of their dented Mercedes. Once these twin deceptions dovetail, her true identity will be exposed, but there are surprises in store for her as well. Mermoud directed. In French with subtitles.