Unfortunately, there is heavy Translation Nathalie Zimmermann who is also a translator of Robert Harris.
Coincidence, she also translated in 1995 the book "Enigma" Harris is not a great achievement of lightness. It is true that "Alan Turing" is also translated by Sebastien Baert and it is not clear who is responsible for these long and convoluted sentences in the part of the mathematical theory, but having read the books of Harris I found the style , so to speak, of Zimmerman.
It will often take paragraphs to keep the wire.
So my opinion is mixed, say five stars for the bottom most one star to form, it gives us six stars halved to average, giving good three stars of my evaluation.
QED