Name: The Walking Dead, Volume 20: All Out War, Part 1
Author: Robert Kirkman
ISBN: 9781607068822

The biggest storyline in Walking Dead history starts here! It's Rick versus Negan with a little help from everyone else!
Collects issues #115-120.
The world we knew is gone. The world of commerce and frivolous necessity has been replaced by a world of survival and responsibility. An epidemic of apocalyptic proportions has swept the globe, causing the dead to rise and feed on the living. In a matter of months society has crumbled: no government, no grocery stores, no mail delivery, no cable TV. In a world ruled by the dead, the survivors are forced to finally start living.