Batal: Volume I of the Spartan Chronicles: 1

Four hundred years ago missiles fell from the sky like rain. Ninety-nine percent of humanity perishes in fire and water. For those that survived the rolling firestorms and mountain-sized rogue waves the radiation set in. Hunting and attacking every living cell always searching always waiting in the water and the air and lurking in the soil. Small pockets of humans evolved to live with the radiation and even thrive within its presence. To survive communities searched and traded for DNA resistant to radiation. Batal Spartan travels from the fortress island of Skye Stone off the coast of northern Africa to the Hiroshima archipelago in search of a woman from his past who has chosen him as her partner. All Batal must do is evade the Northern Horde hunting his group survive the creatures of the sea prove his worth to her and her clan and make it back to Skye Stone alive.