In my novel Pyramid, Jack and Costas revisit the wreck of the Beatrice - discovered in my previous novel, Pharaoh - in order to examine the ancient Egyptian sarcophagus of Menkaure for further clues to Akhenaten's lost 'City of Light'. To find out more about the real-life wreck and the sarcophagus, click here. After a horrifying accident with Costas' submersible, Jack has to make a snap decision ...