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Secret of the Sultan is a 2010 Turkish action film, directed by Hakan Şahin and written and produced by historian and journalist Ömer Erbil, starring Emanuel Bettencourt as an American professor in Istanbul to search for the sultan's mysterious chest in the hidden underground cloisters of the Topkapı Palace with the help of his friend Mark Dacascos. The film, which went on nationwide general release across Turkey on 17 December 2010, was made with the support of the Turkish Ministry of Culture and Tourism and the Istanbul 2010 European Capital of Culture Agency. It was described by Hürriyet Daily News reviewer Emrah Güler as a mixture of the "National Treasure" movies and Dan Brown's "The Da Vinci Code" and "Angels & Demons"