by Mickaël Launay · Editions le Pommier · tapa blanda · ISBN 9782746506985
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For ten years, 18-year-old Apolline and 11-year-old Pierrot have visited the grave of mathematician Henri Poincaré to honor the final wish of their great-grandfather, Théodore Folifou. After a decade of silence, Pierrot discovers a riddle hidden in the will. With their grandmother's help, they uncover the existence of the Olympia Academy, a secret scientific society founded by Albert Einstein in 1902, led by their great-grandfather. To join the academy, the siblings must solve a series of mathematical puzzles and uncover the secrets of a second hidden academy.
