Intriguing...
Intriguing is the word I would use, the feeling and sound are well done. One thing I have to admit though, is that I had to use the walkthrough at a moment.
Why?
Well, there are quite a few combinations you can make on a clock. I do not know where I should have, in game found out what the combination was... perhaps it is wise to be able to find a snipe of paper with a hint... or in the passage of the dinner for one. Also, even if you don't use it, you might want to pick up that gun found in the bedroom. After all, what may come in version 2 is unknown...
I could here the accent in your german, or whomever, said the line for the lady, but it was no problem.
Now I don't mind you want to use an alternate history (I have absolutely no clue if france had a prime minister than), but it might have been better to use a fictional war all together, as this care of problems other people might have with the slightly twisting of facts.
If that is put aside and the earlier two comments taking in I find it very well done game. I will certainly recommend it and follow it with version 2.