The Black Circle
The 39 Clues Series by Patrick Carman
Synopsis (from the publisher): Where are Amy and Dan Cahill? The two kids were last seen in Egypt, hunting for one of the 39 Clues that could make them the most powerful people on earth. But no one has seen the siblings since. Has the ruthless Irina Spasky finally tracked them down? Or worse … the Madrigals? No one knows where the Clue hunt leads next. But one thing is certain — Dan and Amy are gearing up for their most dangerous adventure yet.
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The Black Circle by Patrick Carman — The 39 Clues Series