Miss Trafalgar and Dorothy Boone have grown comfortable in their partnership. The rough edges on the society they formed with their fellow adventurers have begun to smoothe, opening the doors for a new era of cooperation among one-time enemies.

When Trafalgar receives an Egyptian statue, a gift from her former assistant, she asks Dorothy to determine its authenticity. What Dorothy uncovers throws both of them, along with the rest of the Mnemosyne Society, into chaos. With lives at risk and the future at stake, Trafalgar leads a group of reluctant allies from London to Egypt to stop...