On September 3, 1973, at 6:28 PM and 32 seconds, a fly of the Calliphoridae family, capable of 14,670 wing beats per minute, lands on Rue Saint-Vincent, in Montmartre. At the same time, in an outdoor restaurant a stone's throw from the Moulin de la Galette, the wind magically insinuates itself under a tablecloth, making the glasses dance without anyone noticing. At that moment, on the fifth floor of 28 Avenue Trudaine, IX Arrondissement, Eugène Koler, returning from the funeral of his best friend, Emile Maginot, erases his name from his address book.At the same time, a sperm with the X chromosome of Mr. Raphaël Poulain, breaks away from the platoon to reach an egg of Mrs. Poulain, born Amandine Fouet. Nine months later, Amélie Poulain was born.