In this fourth book in the series, Theodosia sets off to Egypt to return the Emerald Tablet, along with its knowledge of some of the ancient world's most guarded secrets. Accompanied by her cat, Isis, (smuggled along in a picnic hamper), Theo plans to return the artifact, then explore the mysteries surrounding her own birth. But nothing ever works out as planned, especially when the Serpents of Chaos are involved . . . 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!