Time travel 3

We let well take this story SF themed time travel.
I liked but not loved.
The assembly is not bad, the end is excellent and we plunged into the classic paradox stories on this theme.
I did not like it at all, for cons, the futuristic world imagined by Barjavel, because little evidence to believe a little too wacky, kitschy for my taste, it lacks credibility but hey after all why not ...
Leaving aside the transition to the future, a good book enjoyable to read.