Paediatrician “Beck” (François Cluzet) is about to have a midnight swim with his wife “Margot” (Marie-Josée Croze) when he hears her scream and then gets clobbered over the head and falls into the water. Eight years later, we discover that she has been murdered and that a stranger was convicted of the crime. Every year, this now single man visits his former in-laws on the anniversary of her death - only this year he’s more disconcerted than usual. That’s because he received a mysterious email that has sewn the seeds of doubt over the entire incident. Quite suddenly, for him, things are startin...