Alexandria, Egypt, 1977. During a dive to an old shipwreck, archaeologist Isabella Warnock uncovers an artefact unlike anything she has ever seen: an astrarium, a mysterious ancient device rumoured to have shaped the destinies of pharaohs 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. Up against a shadowy enemy and a powerful cult prepared to do anything for the treasure, Oliver is catapulted into a breakneck race to protect an ancient secret in a dangerous world of conspiracy and Egyptology, where age-old sorcery and legends clash violently with modern-day ambitions.