New York Times bestselling author Margaret Peterson Haddix makes her debut on the Harper list with a riveting new middle-grade series: The Greystone Secrets. In the first book, three siblings discover that three other children with the same names and birthdays have been kidnapped, and the Greystone kids follow a labyrinth of codes and secret passageways to discover the truth about themselves, and the other children. For fans of Haddix's previous series, The Missing and Shadow Children, as well as readers who enjoy A Wrinkle in Time. Now in paperback.