A nice story, nothing more

I had never read the author before. I remain on a printing mixed.
First, disappointed by the style of writing, perhaps too easy, too simple ... and some frightening scenes shot by their side straight out of a fairy tale or an old series B. 100 first pages I have not made a good impression.
Then, when the investigation begins, it goes better, we remain in a very simple style of course, but the plot takes shape, content finally thickens; it is more consistent!
Many tracks are considered, soon enough we made some comparisons but not all, and the author manages to instill a dose of suspense regularly enough to make reading more enjoyable.
Finally, some criticize sloppy or disappointing end; I find instead that the author is doing pretty well. Just to reveal anything, I just say it would have been churlish to develop further, and this is probably the best outcome he could choose.
In short, and to borrow a phrase used in another comment is literature relaxation, with an unpretentious style (at least I guess!). A lot tied intrigue based on an extremely interesting historical fact that there is much to say and whose wise choice has undoubtedly at work. I spent a while rather nice, although a little long (especially at first), but that cost me dearly for the pleasure I have drawn!