One day in December 1979, in Hersange, an imaginary town in the East of , an entire class is missing and returns the next day as if nothing had happened. Was it a concerted action or a coincidence? A tormented principal, a policeman with a head for maths, and an unabashed teacher investigate in a creeping, equivocal atmosphere littered with false clues. How can an apparently minor event become a real enigma?

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