I started watching this movie on Netflix without having any idea what I was about, and I suspect that is the best way to watch it. Then the vampire twist part way through, while somewhat foreshadowed, is still rather surprising and pleasantly shocking.
Hannah Fierman is the stand out performer as Laura, the young woman fascinated by the drifter Carmilla (Kristen Orr in an understated performance). William Kat is the least convincing, chewing the scenery as Laura's semi-psychotic father.
The movie works in its own right as a modern gothic, ad is also a retelling (rather loosely) of Carmilla that vampire aficionados will appreciate. The movie starts rather slow but the narrative and cinematography built towards an evocative and visually compelling ending.
Highly recommended.
Trailer
Links: IMDB, Rotten Tomatoes.