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Doppelganger is written by Pete Hautman and published by Penguin. It's available with International Standard Book Number or ISBN identification 0399243798 (ISBN 10) and 9780399243790 (ISBN 13).
High school newspaper reporter Roni finds an age-progressed photograph on a missing children's website of a boy that looks just like her sidekick Brian, throwing the pair into an investigation of Brian's past and family heritage.