This final part plunges into the exotic and political with “Ali Pacha,” a ruler both brutal and captivating. His life is told like an eastern legend soaked in betrayal and ambition. Then comes the grim account of the Countess de Saint-G?ran, followed by the fall of Murat, Napoleon’s marshal, rendered with both grandeur and doom. The pace quickens with tales of aristocratic murder and vengeance in “The Marquise de Brinvilliers” and “Vaninka.” It ends with the shocking events around “The Marquise de Ganges.” Dumas closes the collection with a final portrait of nobility undone by passion and death. Each tale is a curtain drop on the theater of crime.