Published March 8, 2011 by Scholastic.
39 Clues Cahills vs Vespers #1 The Medusa Plot
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An explosive new series! After the mysterious Vespers kidnap a number of Cahills, they order Amy and Dan to steal a priceless painting in exchange for hostages. The siblings then rush to Italy where they arrange a heist that rivals the most famous art thefts in history. There's just one problem - the painting they steal is fake. With the clock ticking, Amy and Dan have to track down the real painting before one of the Cahill hostages is lost forever.