Pearls Before Swine

It was most unfortunate that Edna, Dowager Marchioness of Carados, found a strange woman in her son's bed the night before his wedding--it was even more unfortunate that the woman was dead, and that Edna decided to take the body to Albert Campion. He wants to believe that the Marquess of Carados isn't the woman's killer, but a string of baffling clues make him think otherwise.