While investigating a country priest's murder, Jules is lured to a secret base of the League of Darkness, where they are creating a flying ship called the Prometheus. Jules accepts a commission at the behest of the ship's beautiful commander to end the American Civil War, unaware of the League's true purpose. The others come to investigate and the Aurora is taken captive. Rebecca discovers that the League plans to use both ships to help the Confederacy win the Civil War, while Phileas confronts the League's leader, the centuries-old "cybernetic" Count Gregory. Jules is forced to choose between following the commander and the League or Rebecca and his friends.
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