It's (dissapointingly) normal to say a movie doesn't follow a book well, but I was surprised by just how far BOTH movies strayed from the source material of this book. I Am Legend by Richard Matheson 1954 Here you find a thoughtful, plodding, psychological story of one man, maybe the last man alive on earth, and how he deals with the loss of everything and everyone he knows to a great plague that may be vampirism and the great loneliness he feels. It's not a great book, and definitely dated, but it was worth the read and definitely better than either movie. Dark and unrelenting and interesting.