Cameras are now rolling on American Psycho director Mary Harron’s new girl-on-girl vampire thriller The Moth Diaries. Based on author Rachel Klein’s novel of the same name, the film stars Sarah Bolger (pictured above) of Showtime’s “The Tudors,” British model-turned-actress Lily Cole, and Sarah Gadon of Dreamworks upcoming Daniel Craig/Naomi Watts thriller Dream House.

Set in an elite boarding school for girls, the film centers on an emotionally disturbed 16-year-old girl named Rebecca (Bolger) and her growing obsession over the budding friendship between her classmate Lucy and mysterious new arrival Eranessa (Cole), whom she believes to be a vampire.

Scott Speedman (The Strangers) costars as Rebecca’s father-figure crush Mr. Davies, an English Literature professor teaching a course on supernatural fiction.

Harron has described her adaptation as a “chillingly atmospheric horror story” and promises that her screenplay remains true to the book’s Gothic and, most importantly, girl-on-girl vampire themes.

The Moth Diaries is currently shooting in Montreal through Oct. 8.

If girl-on-girl vamps aren’t your thing, you can check out Juno Temple and Riley Keough as teen lesbian werewolves here.