On a fashion warning, easy reading, the author restores some truths about our ancestors the Gauls. The reference to the series Asterix the Gaul serves thread - we realize approximations of Goscinny, obviously, and the author corrects. He knows very well the comic besides, he is obviously a fan.
This is not a "complete" book on the Gallic and their civilization, nor the Celtic peoples of that time. But a great introduction that makes you want to go further.