From the description:
"Robert Neville has witnessed the end of the world. The entire population has been obliterated by a vampire virus. Somehow, Neville survived. He must now struggle to make sense of everything that has happened and learn to protect himself against the vampires who hunt him constantly. He must, because perhaps there is nothing else human left.
Several humanistic and emotional themes in this book blend the horror genre with traditional fiction: we see Neville as an emotional person, and observe as he suffers bouts of depression, dips into alcoholism and picks up his strength again to fight the vampiric bacteria that has infected (and killed off) most of humankind. Neville soon meets a woman, Ruth, (after three years alone), who seems to be uninfected and a lone survivor. The two become close and he learns from Ruth that the infected have learned to fight the disease and can spend short amounts of time in the daylight,slowly rebuilding strength and society as it was."