夜巡
Cal is nineteen years of age, and has been a carrier of the parasite for a year when the novel begins. He is a hunter for the Night Watch, hunting down out of control Peeps (or Parasite Positives) beginning with his ex-girlfriends, whom he infected. The Night Watch dates back to colonial times in America, but has never revealed itself to society for fear of causing widespread panic. The novel focuses primarily on his hunt for Morgan, the mysterious woman who infected him with the parasite. Along the way, he forms a relationship with Lace and discovers that the Night Watch has not told him all that they should have.