January 1820 A glittering ball, a whisper of intrigue and a couple with secrets...Regency London's most glamorous couple, Mélanie and Charles Fraser, have hidden their pasts from aristocratic society - and each other - to become the envy of the ton.But, when attending a Twelfth Night masquerade, a mysterious masked man is found stabbed to the heart; and all their misdeeds and secrets may be dragged into full, merciless light.Mélanie's previous ties to the Empress Josephine - including a promise to her desperate daughter, Queen Hortense, and Charles's secret work for the British government - thrust them both into the search for the killer, taking them from Seven Dials to Mayfair, from viperous thieves' dens to candlelit ballrooms, where the glitter of diamonds can mask the gleam of the knife...