Nineteen year old Cal, a Texas transplant, lost his virginity , and a lot more , when he first arrived in New York City. He became a parasite, positive, or "peep" , he prefers not to use the "v-word." Now he works for the Night Watch, a secret branch of city government dedicated to tracking others of his kind. Unlike the rare natural carriers like Cal, who has acquired night vision, superhuman strength, and a craving for lots of protein, most peeps are insane cannibals lurking in darkness. But now the teen has found the young woman who infected him and learns that something worse than peeps is threatening the city, and he is on the front lines.