Pook Bairings

Or, in other words, book pairings. Citali presents, specifically, nonfiction that complements fiction books in theme or idea. I would completely recommend all of these. The first and second books, respectively, are fiction and nonfiction.

1. The Book Thief by Markus Zusak and The Diary of a Young Girl by Anne Frank. Both set in the terrible times of World War II, one portrays the struggles of a girl on Germany's home front, a girl for whom Death is ever watching; the other is the real-life, beautiful and sad, diary of a Dutch Jewish girl hiding in a "Secret Annexe."  
2. The Anatomy of Curiosity by Maggie Stiefvater, Tessa Gratton, and Brenna Yovanoff and Take Joy: A Writer's Guide to Loving the Craft by Jane Yolen. Two books about the essential curiosity of creating and writing novels and short stories, one is a collection of three fiction works by three young adult authors who specialize respectively in characters, worldbuilding, and ideas; one is a short but sweet author's guide to making work original and interesting to write.
3.  Ender's Game by Orson Scott Card and If the Universe Is Teeming With Aliens--Where Is Everybody?: Fifty Solutions to the Fermi Paradox and the Problem of Extraterrestrial Life by Stephen Webb. Both books tackle one of the most interesting concepts of science fiction, aliens: one is a novel addressing the idea of child soldiers in a war with an extraterrestrial civilization, while the other is a scientific analysis of different theories about the notable lack of discovered aliens.
4. The Call of the Wild by Jack London and Animal, Vegetable, Miracle by Barbara Kingsolver. This one's a bit more esoteric. The novel is a classic tale of awakening of inner instincts, courage, and the meaning of being--from the perspective of a dog-turned-wild; the other is a more human perspective, a memoir of a family's resolution to eat only local food, as it was meant to be. 
5. Carry On, Mr. Bowditch by Jean Lee Latham and Eye of the Albatross by Carl Safina. Also obscure, one is a novelization of the life of a real American mathematician-seaman who revolutionized navigation with a love of mathematics; the other is a love story discussing nature and its essential perfection, how nature must look to animals and how everything is exquisitely designed. Math and nature do go together!