The Black Tower

Strange is determined to learn the secrets of fairy magic so he can restore Arabella. Believing madness is the key to accessing the fairy world, he seeks a way to drive himself insane. However, the Gentleman does not take kindly to the intrusion into his realm, and unleashes a terrible curse to stop him. Norrell's determination to maintain control of all magic in England costs him dearly when the government turns against him, and Vinculus offers Stephen a means to escape from the Gentleman's clutches.

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S01E07 - Jonathan Strange & Mr Norrell