A former voracious insect specialist, now a college professor in search of a simpler life, gets caught up in the investigation of a student who is found dead with his body completely depleted of blood. It first appears that he was murdered by another college student, until the professor realizes that the killers are actually vampire bats that have mutated due to a tainted water supply. As the bats become more aggressive, she must find a way to stop them as they threaten the entire college community.