The evil spirit of a dead mad anarchist, Lazarus, takes possession of Passepartout at a seance for Passepartout's recently-deceased Aunt Louisa. Lazarus, who died at the hands of Phileas, is intent on returning the favor.

Hoping to shift the balance of power in the United States' Civil War, the League of Darkness heads across the Atlantic in the Prometheus while being pursued by the crew of the Aurora.