The year is 1868. Aeronaut Claire Dulac disappears in a daring high-altitude ballon flight. A year later her husband, engineer Archibald Dulac, and her son Séraphin receive an anonymous letter : someone has recovered Claire's flight log, and promises stunning revelations… The pair travel to Bavaria where they discover that a secret space program has started in king Ludwig's own castle. His goal: to send men into space before 1870!
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