The oldest mystery of the ancient world—one sought by kings and scholars alike—remains the secret of immortality.

When Heron returns to Alexandria, she finds the High Priest of Sobek, Lysimachus, has wrested control of the great city of Alexandria from the nobles by demonstrating his mastery over death. Alone and in a city arrayed against her, Heron must find allies, rescue Sepharia from the clutches of the crocodile cult, and somehow find a way to overthrow Lysimachus from his iron-clad control of the city, otherwise she'll lose her beloved City of Wonders for eternity.