The first book I’ve ever written was co-written with Stephen Hawking and his daughter Lucy. It is George’s Secret Key to the Universe. It was published in the UK by Random House and in the US by Simon and Shuster, in 2007. The book went on to be translated in more than 45 languages.

After George’s adventure, I came up with Le Prince des Nuages (The Prince of the Clouds), a trilogy I wrote in French for PKJ, one of the most successful French YA publisher. Le Prince des Nuages tells the story of three friends who live above the clouds. They have to understand how our planet works to save it from a cruel tyrant who wants to turn the Earth’s climate into a weapon of war. Le Prince des Nuages has been translated in 8 languages so far and it has won some of the most prestigious French children book and popular science book awards. The first opus of the trilogy was published in 2009, the second in 2012 and the third in 2013.



Hello, I just finished readying Book One of The Prince of the Clouds and couldn’t find Books Two and Three in English. Is there anyway I could read them in English? I could only find them in French, which I don’t understand.
Dear Anh, did you read the first one in English?
Please can you arrange to have these books translated into English. I would love to buy them for my grandchildren. They can’t speak French yet, although the eldest (aged 8yrs) has just started learning.
This unfortunately is not my call…
hello Christophe, do you know if these books are translated into Spanish? Thank you
Yes, dear Patricia, they are. El Universo en tu Mano, published by Blackie Books.
All best,
Christophe