NICHOLAS DAY is the author of The Mona Lisa Vanishes, winner of the Robert F. Sibert Award and the Boston Globe-Horn Book Award for nonfiction, and A World Without Summer, which received four starred reviews. He is also the author of the picture books Nothing, illustrated by Chris Raschka, and How to Have a Thought, illustrated by Hadley Hooper. His writing has also appeared in Slate, The Washington Post, and The Atlantic, among other publications. He lives in Western Massachusetts with his family.