Book Ten showcased the massive war between Negan and the saviors and this books highlights the after effects. After Alexandria is destroyed, the remaining communities unite for one last stand against the Saviors. They are enraged at how unfair Negan has been fighting (he was infecting all their weapons with walker blood to infect and kill all the wounded) and decide to take him down once and for all. The aftermath of their war leads to the biggest status quo change that we've seen soo far. Shit is on the mend. The only problems are little problems. Too much good may be occurring, I fear what book twelve will bring. This much peace and prosperity cannot last!