This bestselling series comes to a rousing conclusion as Celie and her family set sail on a ship made from their beloved Castle! After constructing a grand ship built from parts of the Castle, Celie, Lilah and Rolf are ready to set sail! But on its maiden voyage, the Ship steers them far off course into uncharted waters. Celie and her sister, Lilah, hope that the Ship is heading to the ancient island where unicorns once roamed, but as the journey grows longer and supplies run low, they could be in trouble. Can Celie and her family trust the Ship just as they've always trusted the Castle? Readers will delight in this adventure-filled conclusion to Jessica Day George's bestselling series.