Sadly, Not Literally About Moths: Moth Diaries Trailer
And here's the obligatory summary:
Adolescence is and always will be a time of intense emotional confusion, especially if you spend it in a closed environment. That's the case with Rebecca, a young girl haunted by her father's suicide, who is a student at an exclusive female boarding school. She pours her heart out in a diary, much of it focused on Lucy, her beloved roommate. Their relationship changes drastically with the arrival of a mysterious new student, Ernessa. As Lucy abandons her for this new girl, Rebecca becomes consumed with thoughts of jealousy and suspicion -- Ernessa is dangerous, evil, a vampire. Is there any truth to all this or is Rebecca slipping into insanity?
A vampire! But she doesn't even sparkle!
This is one of those trailers that has to fight a bit of an uphill battle since it's so easy to pigeon hole the material into uncomplimentary company. But it has Mary Harron directing for only the second time since American Psycho, and Lily Cole is convincing as a creepy succubus even when she's not acting. So it's got that going for it. It's getting a release April 20th.