Morts is a nice addition to the Fate Core Series. You get a descent build for your future stories and a "reason" for your players to go nuts while keeping them under control. Zombie removal is for the insane, ecentric, and poor/desprite.
You get three new races/builds to play around with and this is one of those "zombie worlds" where society already collapsed and just picked itself back up again.
While the material they give you is a little bit short... it's an addition to my RPG library that I gladly recomned to someone else if only to see another group have a skelton, human, and ghost all argue about if it would be culturally insentive to start singing the ghost buster theme song while they are shooting zombies in the face lead by an undead specetor that wishes to destory their town... over a parking ticket.