A group of graduating medical students find an unfinishied letter with blood stains and references about human vampirism virus. The said letter came from the former Chief of Police of Pilar, a remote municipality. Years ago, there was a killing spree in San Esteban, one of its far-flung barangays. No once can tell who did the killing. Only a letter provides a clue but due to insufficient evidence, the letter was dismissed as a hoax. Will the students be able to prove the existence of vampirism?