Jonathan Strange & Mr Norrell is the first novel by British writer Susanna Clarke. An alternate history set in 19th-century England around the time of the Napoleonic Wars, it is based on the premise that magic once existed in England and has returned with two men: Gilbert Norrell and Jonathan Strange. Centering on the relationship between these two men, the novel investigates the nature of "Englishness" and the boundary between reason and madness. It has been described as a fantasy novel, an alternate history, and an historical novel.