Though the narrator's life is peppered with myth, demons, werewolves, god and goddesses, the only thing stronger and more sustaining is his friendship with Ruby. "From now on," Ruby says to her friend, the narrator, "We're going on the Stone Age diet. It means we only eat the sort of healthy things our ancestors would have eaten. Raw grains and fruits and stuff like that. That's what our bodies are made for." An admirable plan, but Ruby...