I thought this was the final instalment of this series, but it is not so; there are three more books, which I plan to read at sometime or the other. This novel continues with the story of Walt, who is the hero of Book-1, a few years after the attack by the aliens that nearly wiped out the humankind. It also introduces Raina, a teenager who has lost her parents to the alien-created plague, whose adopted family is taken away by a power-hungry leader of the survivors. This book is as absorbing as the previous ones, with great characters and fast-paced action. Apart from the many wisecracks which are annoying after a limit, and the brief, seemingly purposeless appearance of the characters from Book-2, I had a lot of fun reading this well-written story of the survival in the post-apocalyptic America.