Blackout, by Mira Grant

This is the last of Ms. Grant's trilogy; I read it almost immediately after finishing the second volume, and between both books I've neglected both chores and sleep.  It was worth it.

Unfortunately there is very little I can say about this novel that won't be a spoiler.  It is a certainty that if you've read the first two volumes, you'll want to read this one.   I'll say this much:  the ending is good.

Blackout (The Newsflesh Trilogy)