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The Missing Heir is written by Tracy Barrett and published by Macmillan. It's available with International Standard Book Number or ISBN identification 0805080473 (ISBN 10) and 9780805080476 (ISBN 13).
Xena and Xander Holmes, an American brother and sister living in London, use clues from their ancestor Sherlock Holmes' casebook to help classmate Alice Banders, who goes missing following the announcement that she will be crowned queen of Borogovia after her 13th birthday. Illustrations.