With Stockman dead and his forces routed, the Astoria Compound's greatest threats are diminishing food supplies and fractious refugees. The problems are mounting and there are no easy solutions. Then a bomb attack inside the Compound brings an unwelcome discovery: drug-resistant Infected, infiltrating the refugee camp. Miller and his team are co-opted for OPERATION CASPIAN TIGER, an attempt to root out the infiltrators, but is a more extreme solution needed?

Extinction Biome is a new military-SF series about a world overrun by an ancient ecology, awakened from a millennia-long dormancy to destroy the human race; and about the decisions we must make to try and survive.