In 410 AD the Great Library of Alexandria was under siege for the last time. Political and religious mobs were out to destroy the library and kill it's charismatic and beautiful leader, the world-famous mathematician, Hypatia. In order to save her life, Hypatia agreed to create a coded message engraved on a block of black granite, for the Hetairoi, the descendants of the personal guards of Alexander the Great. This message leaves clues to...