Maggie Hope returns to protect Britain's royals against an international plot--one that could change the course of history. As World War II sweeps the continent and England steels itself against German attack, Maggie Hope, former secretary to Prime Minister Winston Churchill, completes her training to become a spy for MI-5. To her great disappointment, she is dispatched to go undercover at Windsor Castle, where she will tutor the young Princess Elizabeth in math. Yet castle life quickly proves more dangerous--and deadly--than Maggie ever expected.