Susan Cooper wrote "The Shortest Day" for John Langstaff's Christmas Revels, where it is performed annually across the country. She is the author of the classic five-volume fantasy sequence The Dark Is Rising, which includes the Newbery Medal winner The Grey King, as well as many other books for children and adults. She lives on a salt-marsh island in Massachusetts, USA.

Carson Ellis is the creator of the New York Times bestseller Home and the Caldecott Honor Book Du Iz Tak? She is also the illustrator of The Composer Is Dead, written by Lemony Snicket, and Dillweed's Revenge, written by Florence Parry Heide. She also collaborated with her husband, Colin Meloy, on the bestselling Wildwood series, and created the art for the albums of his band, The Decemberists. Carson lives with her family outside Portland, USA. Find her online at carsonellis.com and on Twitter and Instagram as @carsonellis.