In a city ravaged by disease, one mistake could mean the difference between life and death.

James and his group come up with a plan to reach the military checkpoint, but they realize too late that danger comes not just from outside the safety of the town hall, but within it, too.

Heather needs to decide whether she can trust a group of strangers to help her and her sister.

Pierce's team has been left stranded in the city, and they can no longer count on extraction. They must find their own way out.

Still trapped at the lab, Daniel and his coworkers succumb to madness and disease one by one as the days go by.

In order to protect her son who is growing increasingly ill, Krista must take drastic measures. Is there a cost too high?

With the number of the living dwindling and the infected increasing, one thing is clear—the city is a tomb, and it won't allow anyone to leave freely.