At Buckingham Palace, Queen Elizabeth II must deal with the Brexit referendum and a new female prime minister—yet these are the least of her worries when a staff member is found dead. One of the Queen's favorite paintings has been misappropriated, and in this sequel to The Windsor Knot, disturbing letters are circulating in the palace. The Queen's courtiers think they have it "under control," but Her Majesty—the keenest sleuth among them—can see connections where no one else can.