by Patrick Carman · Scholastic US · tapa dura · ISBN 9780545060455
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«The Black Circle» is Patrick Carman's young adult adventure novel, fifth installment of «The 39 Clues» (Scholastic US, hardcover, 176 pages, in English).
A mysterious telegram signed with the initials NRR leads siblings Amy and Dan Cahill to Russia, far from the only adult they trust, in a race to recover a treasure stolen by the Nazis and uncover the truth about the murder of the last Russian imperial family. They must decipher codes and evade Irina Spasky and the Madrigals.
The original publication dates from August 11, 2009.
Aimed at readers aged 8 to 12, especially those seeking mystery and action series with young protagonists.
Patrick Carman is an American writer and a graduate of Willamette University.
