This is book number 1 in the Deadland Saga series.
(Part 1 of the Deadland Saga: A journey through Dante's Inferno with a shambling twist.) In one day, the world succumbed to a pestilence that decimated the living. In its place rose a new species: vicious, gruesome, wandering zombies with an insatiable hunger for the living. There is no government. No shelter. No hope. Still in her twenties, Cash has watched her friends die, only to walk again. An office worker with few survival skills, she joins up with Clutch, a grizzled Army veteran with PTSD. Together, they flee the city and struggle through the nine circles of hell, with nothing but Clutch's military experience and Cash's determination to live. As they fight to survive in the zombie inferno, they quickly discover that nowhere is safe from the undead...or the living. 100 Days in Deadland is a journey through the first poem in Dante Alighieri's Divine Comedy, the classic tale on the horrors of hell... zombie apocalypse style