>>24579385 (OP)Nonfiction books are useful research tools for writing fiction. I've read books on nautical exploration, polar exploration, the SAS Survival handbook, the crusades, revolutions, animal husbandry, mountain climbing, old travel journals, and one of the most inspiring things I've ever read was a journal belonging to a friend's great grandfather about his experiences fighting in France in WWI. All of these books were monumental in inbuing my works with authenticity.