One of the most influential vampire novels of the 20th century, I Am Legend regularly appears on the "10 Best" lists of numerous critical studies of the horror genre. As Richard Matheson's third novel, it was first marketed as science fiction A terrible plague has decimated the world and those who were unfortunate enough to survive have been transformed into blood-thirsty creatures of the night. Except, that is, for Robert Neville. He alone appears to be immune to this disease, but the grim irony is that now he is the outsider. He is the legendary monster who must be destroyed because he is different from everyone else.