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. He is also the author of the picture book Nothing, which received three starred reviews, and the adult narrative nonfiction title, Baby Meets World. He has written regularly for Slate; his work has also appeared in the Atlantic, the New York Times, and the Washington Post, among other publications. He lives in Western Massachusetts with his family.

YAS IMAMURA is an Asian American illustrator living in Portland, Oregon. Her works include collaborations with Anthropologie and Sanrio, as well as her growing list of children's books, including Love in the Library by Maggie Takuda-Hall, which received four starred reviews. Her preferred materials are gouache and watercolor and often finds herself drawn to projects that are playful, mysterious, and a little offbeat.