Cannibalism

Edges of Darkness tells the tales of three groups of survivors held up in an apartment complex during a zombie apocalypse. With their food supply dwindling, a vampire couple kidnaps a young girl. They intend to bleed her slowly to survive. Of course things don't go exactly has planned. Dean, an obsessed horror writer is hold up with his neglected wife, Dana. Dean keeps his sanity by burying himself in his writing. He installs a new processor to run his computer on their limited generator power, but soon finds out there's a high price to pay.