Robert Holdstock 
Shadow of the Wolf [EPUB ebook] 

When Odin’s curse fell upon him, Harald Swiftaxe, the young Norse warrior, lusty in love and battle, was fully human no longer. He was incensed with the animal rage of the god’s devotees, the Berserkers. The snarling ferocious savagery of the bear possessed him. Immune to fire and steel, frenzied by the smell of blood and the sight of torn human flesh, he was driven to the worst of human deeds . . . The stench of fear was meat and drink to him, and cowering women learned of his cruel, insatiable lust.The bear screeched its ecstasy – yet at times the man dimly understood the horror. Could the demon god be killed, the spell lifted…? If there was a way, the price of failure would be high, greater than death itself . . .