We find pleasure in this novel heroes have met in Thanatonautes and Empire of Angels. We can blame Werber to always write the same way, the fact remains that this is very effective and it is difficult to close the book so we want to know what happened, a sign that it is successful. It remains unsatisfied at the end of reading and all you want, read the second book to find out what is behind.
A book recommended to all the faithful of the same author if it is perhaps not his best. Nevertheless, it is best to start with Les Thanatonautes and Empire of Angels to enter some details.