A plague has transformed humanity into intelligent, blood-drinking creatures. Vann Arnett survives alone in his fortified mansion, haunted by the loss of his daughter and his wife's transformation. When a military convoy arrives seeking survivors, their presence triggers a catastrophic confrontation with the organized vampire society living in the city's underground tunnels. As soldiers fall to betrayal and bloodshed, Vann discovers that some monsters might be more human than the men sent to save him.