Hello! So I am working on a post apocalypse novel. However I do not have like any sub plots, here is the current plot:

This takes place 7 years into the apocalypse, lurkers seem to be slowly disappearing around them. Until a horde of over a thousand come across them. While it seems they are carrying around a immune to the infected this entire time.

Any additions to the plot, and any sub plot ideas? Thank you ^^

Maybe there is a single place that is untouched?