In this fourth book in the popular series, Theodosia sets off to Egypt to return the Emerald Tablet--embedded with the knowledge of some of the ancient world's most guarded secrets.

Accompanied by her cat, Isis (smuggled along in a basket), Theo plans to return the artifact, then explore the mysteries surrounding her own birth and oh, yes--help her mother dig up treasures on her archeological expedition.

But nothing ever works out as planned, especially when a precious treasure appears suddenly, and then just as suddenly disappears . . . When the Serpents of Chaos get involved, Theo finds she's digging up a lot more than she expected!

This highly praised, exciting middle grade series is a must for fans of mysteries, humor, and nonstop action.