Bound to keep a promise to her dead uncle, Is travels to the mysterious north country to find two missing boys–one of them a prince–and to discover why so many children in London are disappearing.

• ISBN: 9780385308984
• Author: Aiken, Joan
• Published: 1993, Delacorte Pr
• Themes: Adventure, Coal mines, mining, missing people
• Descriptors: England (UK), Intermediate (ages 9-14), Mystery and Thriller
• No. of pages: 242