Is (novel)

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Is, known in the United States as Is Underground,^[1] first published in 1992, is the eighth book in the series of novels by Joan Aiken normally called the Wolves Chronicles and sometimes the James III sequence. Where previous books have followed the characters Bonny, Sylvia, Simon, and the street-urchin Dido Twite, this marks the first appearance of Dido's sister, Is Twite, as the protagonist. The story follows Is from London to the fictional town of Blastburn (also mentioned in Midnight Is a Place) in the north of England, in her quest to discover the mystery behind the disappearance of many London children and to track down two missing boys in particular. Like the rest of the books in this series, Is takes place in an alternative history version of the early nineteenth century and has elements of steampunk and magical realism.

The UK edition was illustrated, as were most of the Wolves Chronicles and many other Joan Aiken books, by Pat Marriott.