The Cold Smell of Sacred Stone (A Mongo Mystery, #6)

Garth's poisoning by a mysterious substance, combined with his experiences related in "The Beasts of Valhalla, " changes his personality, causing him to become estranged from Mongo and his family--and resulting in tens of thousands of people coming to believe that he is the promised messiah. I was on an errand to help an injured friend who scoffed at my insistence that he was in great danger from a pale-eyed, monstrous ninja who could do just about everything but walk on water, and who was working for a dead man.