A royal palace. A closed book. A betrayal that will echo through generations ... Windsor, 1940: War rages, and as bombs rain down across Britain, nowhere is safe: not even a royal palace. Secretly tasked with foiling a suspected plot, Sophie Klein is placed in the Royal Library at Windsor castle, where the princesses reside. But when she learns that Windsor is compromised, Sophie must sacrifice everything she knows to save the future queen of England ... Philadelphia, Present day: Digging into her great aunt's family tree, Lacey Turner comes across a mysterious book bearing the stamp of Windsor Castle's royal bindery. But how did it come to be in her family's possession? And so begins a journey that will take Lacey from battlefields to Buckingham palace in a quest to reunite the book with its rightful owner.