James Axler - Blood Harvest

The cataclysm of nuclear winter transmuted the world into a place both torturous and unforgiving. But there are those with the courage and perseverance to seek out something beyond the merciless life-and-death struggle of Deathlands. In a treacherous frontier that plays for keeps, staying alive is the best victory….Washed ashore in the North Atlantic, Ryan Cawdor and Doc Tanner discover two islands still pristinely intact after Skydark, but whose inhabitants suffer a darker, more horrifying punishment. A hideous strain of mutation manifests, turning some into half-monstrous giants with an unquenchable thirst for blood. The Nightwalkers unleash a hellish feast of horror when the sun goes down. Now Ryan and Doc struggle to survive this enclave of unimaginable terror, trapped in a baronial conflict between the rulers of night and day, with only one way out–internecine war in a world of the damned….