Book excerpt: When a nobleman's mistress is gunned down on the steps of the Covent Garden opera house, brilliant adventurer Atlas Catesby discovers a sinister family connection that compels him to investigate. London, 1815. Amateur sleuth Atlas Catesby is about to discover the dark side of the bright lights. His long-awaited night at the opera with Lady Lilliana ends abruptly when a notorious courtesan is shot to death in Covent Garden. The infamous victim was the mistress of the powerful Marquess of Vessey. Atlas believes that the marquess--his former brother in law--is responsible for the long-ago death of Atlas's sister, Phoebe. Atlas seizes the opportunity to potentially avenge his sister's death. But his inquiry is complicated when Phoebe's grown son implores Atlas to help prove Vessey's innocence. Plunging into the cutthroat backstage life of the theatre community, the adventurer and the noblewoman soon discover that ruthless professional rivalries can escalate into violence, setting the stage for death in Murder at the Opera, D. M. Quincy's third riveting Atlas Catesby mystery set in Regency England.