The first book in the series begins with a secret ritual taking place in a mystical temple in Istanbul, which draws not only human spies but also invisible beings' spies into an unusual intelligence war. A door to the mysterious realms is knocked on in this book. It will gradually open in the subsequent episodes of the series. The Templars excavate in Baghdad to find the throne of Bilqis, the Queen of Sheba. Can't find what they're...