In the small town of Spring Hill, Kansas, Connie Deacon comes face to face with the horrors of the day. A marching mob of undead, and soldiers on a rampage.

As the attack on Kansas City goes horribly wrong, Captain Bennett leads a small team into the city on a rescue mission.

As Atticus recovers from his recent adventure, he reads over the files handed to him by the mysterious Agent Madison, learning of the trials and tribulations she faced on Day Zero.

With trained killers in hot pursuit, Atticus and Madison must make a final stand.

Realizing the severity of the situation, Atticus joins forces with the civilian survivors in a daring rescue mission.

With the mission going completely off the rails, Atticus joins forces with Madison to fight against a significant, growing threat.

After a brief stop in the small enclave of Moorecroft, Atticus gears up to tackle his biggest challenge yet. Investigating the abandoned military communications outpost in North Platte, Nebraska.

With his first job a success, Atticus continues on down the rails towards Helena to deal with some local troubles.