The year is 1780 and the Devil’s Isles, a group of islands in the North Atlantic Ocean, have recently been conquered by Britain after a brief war. The inhabitants of the Devil’s Isles practice magic and both human and animal sacrifice. Nebula, a young princess from the islands, struggles with this and is beginning to question what she has been taught.

Aware of a plot to kill everyone on the islands, Nebula defects to the British side where she takes on a new identity and a new life. Under the name Adeliza, she works in England as a maid for a Dr Moon. Only two men know her real identity; the kind-hearted doctor and the seemingly terrifying Mr Lastman.