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272 pages ; 22 cm.
New York, NY :
|| When Mary and her sister Betty visit the Ivy Bay lighthouse with their friend Henry, Mary stumbles upon a crude map. Henry wonders if it might be connected to his ancestor David, who was accused of stealing a large sum of money and a precious family heirloom. Mary decides to investigate, but solving a crime committed almost a century ago isn't easy, and a surprising number of people don't want her to succeed.