Alice and Celine, portrayed by Jessica Chastain and Anne Hathaway, are more than just next-door neighbors—they’re inseparable best friends. Their lives in the idyllic 1960s seem picture-perfect, complete with all the charm of the era. But when a devastating accident shatters their world, the cracks begin to show. As guilt, paranoia, and suspicion seep in, the question lingers: is it merely a fracture in their bond, or could it be something deeper—a mother’s instinct?