It's a French production and as far as I know it's never had distribution in UK (apparently it was called Dark Portals in the US) so is kind of hard to get hold of. It's a supernatural detective story set in 1830's Paris and is startlingly beautiful to look at, perhaps one of the best looking films I have seen. Shot entirely digitally it can feel like a TV movie at times, but usually each scene is as good as a promotional still. I'm a bit of a style>content geek so I was blown away by the use of limited colour palettes and astounding cinematography. That aside, it's a well told mystery too with a creepy cloaked and mirrormasked baddie and wonderful sets.
Comparisons to From Hell and Sleepy Hollow are justfied I'd say.
Just more beautiful.