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 and was called “sharp and vivid” by the New York Times. He is also the author of the picture books Nothing illustrated by Chris Rashka and How to Have a Thought illustrated by Hadley Hooper. He lives in Western Massachusetts with his family.

BRETT HELQUIST is the illustrator of classics such as A Series of Unfortunate Events by Lemony Snicket, The House of Bunnicula by James Howe, and books by Blue Balliet, including the New York Times bestselling Chasing Vermeer. He is also the illustrator of The Mona Lisa Vanishes, winner of the Robert F. Sibert Award and the Boston Globe-Horn Book Award for nonfiction.