Mankind is no longer at the top of the food chain.
The Sixth Extinction is an apocalyptic tale about a pandemic that sweeps the globe, decimating the human race, leaving humanity struggling to survive. Within three weeks, everything has changed. Social structure has collapsed as the government locks itself away with a select portion of its vast army in deep bunkers, leaving the civilians to their own fate and the infected that stalk the streets.
The group narrowly escapes with their lives from a barn, as Stitt and his men attack them while they rest. They flee into the night, but are soon brought to a stop as their jeep and truck slam into a Chevy blocking the road. It is an ambush. There is a standoff. Whoever fires first will give their location away and will be a sitting target. With Jessica seriously hurt, and Bonnie losing her mind with grief, time is of the essence.
Meanwhile, Doctor Bachman has teamed up with two lab assistant survivors, Emma and Peter, and together they have concocted a plan to stop the creatures from reaching the surface and releasing new strains on a world that is still struggling to survive. They plan to reach the supercomputer in Zone 12, and reset a fail-safe device that should eradicate the creatures and the spores before they reach the surface. They just have to survive long enough to implement the plan.
Also a new group of survivors arrive at an unlikely moment. A group that has learned they have to fight to survive. And with them they bring a new form of transport that could be the answers to all their prayers.