Lady Eustace—more familiarly known as Lizzie—is very beautiful, very clever, and very rich. On closer inspection, she turns out also to be a “nasty, low, scheming, ill-conducted, dishonest little wretch.” Her calculated marriage to a wealthy but sickly young baronet brought her the wealth she desired, including a spectacular diamond necklace which she wore in the days before her husband’s demise. Upon his death, the lawyer for the estate is...