Once good friends, 14-year-old Avery Armisted and 16-year-old Kayla Butts begrudgingly travel to Spain together for a summer vacation where they uncover a secret their families kept hidden from them their entire lives in this haunting new novel by a "New York Times"-bestselling author.

Margaret Peterson Haddix is the author of many critically and popularly acclaimed YA and middle grade novels, including the Children of Exile series, The Missing series, the Under Their Skin series, and the Shadow Children series. A graduate of Miami University (of Ohio), she worked for several years as a reporter for The Indianapolis News. She also taught at the Danville (Illinois) Area Community College. She lives with her family in Columbus, Ohio. Visit her at HaddixBooks.com.