Apocalypse

MBtGE recommended After the Apocalypse by Maureen F. McHugh.  Short stories with a End o' the World theme

The first short story in this collection is post Level 4 Zombie Outbreak.  Cleveland has been turned into a wall off area where folks dump their felons and they end up being zombie food.

One of the prisoner ends up noticing things about the Zombies in this first story "The Naturalist"

Like,  Zombies are attracted to fire.  When the fire goes out, they disperse about their zombie business.  If a human is on the other side of fire he might as well be invisible.  Until the fire goes out.  A victim about the line of sight even a little bit might as well not be there, even if in clutching distance.

The Naturalist, of course, does his experiments with other shanghaied prisoners.  So he is no angel.