Assaulted Souls - Assaulted Souls Trilogy, #1

Nathan King wakes up one day freezing cold and starving with hunger on a tattered mattress in a dark cave, and has no idea where or who he is. He meets Edward Sole, apparently his protector for the last few months, who tells him a nuclear bomb has been dropped and most, if not all of the world, has been destroyed. Slowly the realization sinks in that in this horrific post-apocalyptic landscape, there are no rules, no laws.
Cannibalism is rampant, mutant animals and humans are on the attack. With all communication cut off, and meager supplies, every day becomes a fight for survival and sanity. To make matters worse, a band of savages called The Neanderthals have emerged who rape, pillage and murder for more than just survival. They enjoy it. Fighting for their survival and hoping to find a more hospitable island off the coast of Prince Edward Island, Ed and Nathan team up with Cadence Whitaker, Nathan's girlfriend whom he has no recollection of, and fierce warrior Velvet Jones to try and hatch a plan to escape the island before they're all killed.
In the meantime, Ed has begun a slow descent into madness, leaving the group wondering who the enemy really is. A lightning-paced, action-packed exploration of a terrifying existence in a wasteland resulting from humankind's stupidity.