Zombie Apocalypse — Susan Hart

Zombie Apocalypse, tells the story of a man and woman who find themselves together after the Zombie apocalypse hits and through determination and a bond which quickly forms between them, decide to fight for the survival of humanity any way they can. They want to head for the West Coast in search of other human survivors but first, they have to survive their first night together in the deserted and abandoned city, where the only things that move at night are zombies and a few feral animals.