Alexandria, Egypt, 1977. During a clandestine dive to an old shipwreck, archaeologist Isabella Warnock unearths an artefact unlike anything she has ever seen: an astrarium, a powerful ancient device rumoured to have shaped the destinies of pharaos and kings since the beginning of time. But her discovery comes at a terrible price, and it falls to her husband Oliver to keep the priceless object safe. Grief-stricken, Oliver refuses to believe in the astrarium's mysterious significance - until he finds himself up against someone willing to go to any lengths to obtain the powerful device.