242 pages
English language
Published Nov. 2, 1995 by Bantam Doubleday Dell Books for Young Readers.
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Dido's sister, Is, travels north to try and find her lost cousin. But instead of the promised Playland, she discovers an underground kingdom where children work as slaves in the worst conditions imaginable -- under the rule of the sinister "Gold Kingy".
Also published as plain old "Is".
Subjects
- Adventure and adventurers -- Juvenile fiction
- Coal mines and mining -- Juvenile fiction
- England -- Juvenile fiction