Exodus (Green Fields #9)

They are here to find the cure—in a secret laboratory hidden underneath a metropolis overrun by zombies. What could possibly go wrong?

Finding the French Resistance was only the first step in achieving their mission. With impossible odds looming ahead, Bree is forced to bury the hatchet and work with Bucky Hamilton and his men to get to their destination—a secret underground lab previously part of the serum project that might just hold the most valuable thing on earth: a cure for the zombie virus. Too bad that it’s located in Paris, a city that had a population ranging in the millions before the apocalypse happened—and as they are to find out soon, things went down very different in Europe from what they have gotten used to in the States. Can they find the cure—and can they even get to where it might be stored? And, more importantly—is the cure the actual reason Hamilton was sent to breach that lab? Time will tell—if they don’t run out of people first.

Books in the series (so far):
#1: Incubation
#2: Outbreak
#3: Escalation
#4: Extinction
#5: Resurgence
#6: Unity
#7: Affliction
#8: Catharsis
#9: Exodus

If you're not sure you want to embark on a journey thousands of pages long that isn't complete yet, the first six books in the series can be read as a complete set that will leave you with a satisfying ending.