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Great Britain, 1927 Noémie and Emilien are not children like the rest: cousins from a wealthy family, they spent their childhood at boarding school, hardly seeing their parents! They got used to this independent life, far away from the hustle and bustle of war, and created their own world.

When Noemi's parents returned home and took the children back to the huge family mansion, the children were confused...

But the place is magical, with rooms filled with inventions from Emilien's father and thousands of places to explore. So they decide to try out this new life, especially since there is still a mystery to be solved: where is Alexander, Emilien's father? Is his sudden disappearance connected to the machine he was building for the Jules Verne competition?

Welcome to this mystical world where two restless children dive into an extraordinary adventure!