I Am Legend by Richard Matheson is about Robert Neville, the last man in the world. The key word in that sentence would the last man. Vampires exist in this world and they've overtaken the human race, humans are dwindling until only our protagonist remains. The book spans over the course of two and a bit years and deals with some flashbacks from the beginning of the plague. 
 Robert Neville is the epitome of a broken man whose morals and beliefs have been battered down by the plague and his attempt to understand just what happened to his own family. Neville is courageous and cunning in his attempts to stay alive and ahead of those who want him dead. The way he runs himself down in an attempt to figure just what had happened to those infected with the plague and how it started shows just how determined this man was and it struck a chord and begged the question, just how far would you go to survive? 
 The book expertly deals with the way a person would feel after no human contact (bar the battering hoard of vampires at his door each night) would feel in such isolation. Whilst i had previously heard the ending i was still shocked when it came about and i enjoyed the way the author decided to end the book.