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A New York Times Bestseller written by Blue Balliett. Supersleuths Petra and Calder, along with Calder's friend Tommy, have been drawn into another mystery -- this time involving a Frank Lloyd Wright architectural masterpiece, the Robie House. When the kids' sixth grade class attempts to save the house from demolition, eerie events are reported: Voices float out from within, shadows shift behind the art-glass windows, even the roof moves. Soon the three are involved in a frightening search for ghosts, hidden treasure, and a coded message left behind by Wright. Can thy pursue justice and escape with their lives?
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🇺🇸 Ship from USA · On Agora since 2026
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