In the history of Anne Perry’s bestselling Victorian mystery series, the stakes have never been greater than now—as a mission for queen and country places the future of the British Empire squarely in Thomas Pitt’s hands. It is not the custom for the commander of Special Branch to receive a royal summons—so Thomas Pitt knows it must be for a matter of the gravest importance. The body of Sir John Halberd, the Queen’s confidant, has been found in the shallow water of the Serpentine in Hyde Park, bearing the evidence of a fatal blow to the head. At Her Majesty’s request, Sir John had been surreptitiously investigating Alan Kendrick, a horse-racing enthusiast who seems to have had an undue amount of influence on her son, the Prince of Wales.