Prairie Gods (Prairie Gods #3)

No Man's Land. Bill Roberts, a sprightly 124-year-old, tells Freddy Davis a story about his time in WWI. While on a night-time trench raid, a shell burst and knocked him unconscious. He awoke to find a creature injecting him with healing serum. When Germans attacked the creature, Bill fought them off and took the creature to get more of the serum for itself. Once onboard its ship, the creature revealed itself to be a human woman. Bill has never been injured or had an illness since.