On Saturday October 19, a party was held at Buckingham Palace, London, to celebrate Queen Henrietta’s 80th birthday. The invite list included all the major aristocracy of Britain and Europe. On that night, unruly Princess Arabella Wellington, who was second in line for the British throne, was murdered. You have been hired to investigate six of the evening’s most notable attendees—figures whose glittering reputations could not shield them from suspicion...