Book six in USA Today bestselling author Nicholas Sansbury Smith's propulsive post-apocalyptic series about a soldier's mission to save the world. A new monster emerges...The newly christened leader of Delta Force Team Ghost, Corporal Joe Fitzpatrick arrives in Normandy. The war to free survivors and eradicate pockets of adult Variants and their offspring is underway by the Unified European Forces. But as the troops push east, rumors of a new type of monster spread through the ranks.Back in the States, the adult Variants have all been wiped out and the juveniles are on the run. But Master Sergeant Reed Beckham and Dr. Kate Lovato soon realize there are other monsters on the home front. And they may be human...The Extinction Cycle:Book 1: Extinction HorizonBook 2: Extinction EdgeBook 3: Extinction AgeBook 4: Extinction EvolutionBook 5: Extinction EndBook 6: Extinction Aftermath