Horror from the land of the long loaves and the Eiffel Tower

Difficult to votes, 3 stars but it is worth it to me.
The film is actually quite mysterious, later, he is still gloomy - in the truest sense of the word. Fully understand the story I have not now, vampires are at work, demons or just the pensioners on drugs. - But that remains a mystery until the end, then the genre typically fails.
Who wants to shudder a bit is well served, who is a real story with depth and background should keep looking.