...then I can heartily recommend

World War Z: An Oral History of the Zombie War / World War Z- (Wiki synopsis)

It's actually a lot better than the title, and the Zombie Survival Guide to which it is the sequel, would suggest. The author has really thought hard about what a "zombie" outbreak would do to the world political system and to the art of war; i.e., the return of infantry lines and squares; the need for new TTPs to deal with the undead (do not use land-mines because you want zombies standing upright to get the headshots needed for the HEI rounds to work); the development of the "lobo" a dual entrenching and lobotomisation hammer-thingy; the destruction of the three gorges dam in China as viewed from the international space station; the initial outbreak in China and its rapid spread throughout the world (think Stephen King's The Stand written as a global military history) et al. Although a work of fiction it is very plausibly done...I read it in a day and it gave me the heebeegeebees