MOTHERS’ INSTINCT is a dark, twisty domestic thriller in which the bond between two couples - best friends and next-door neighbours - mutates in dangerous and deadly ways in the wake of a tragic accident. David and Laetitia and Sylvain and Tiphaine are inseparable friends and next-door neighbors in a pretty, tranquil suburb. Their sons Milo and Maxime, born in the same year, grow up together as close as brothers. But when Maxime is killed in an accident, their idyllic world shatters. Maxime's parents, Sylvain and Tiphaine, are consumed by grief and bitterness, while David and Laetitia are wracked with guilt for their role in the tragedy. Soon the couples are barely speaking, although they maintain a polite façade. Then a mysterious series of “accidents” begins to happen to Milo, raising Laetitia’s suspicions.