The Cottage

The lake house where Joe Quinn and Eve Duncan live with Jan MacGuire.

Herculaneum

The ancient city destroyed by the volcanic eruption of Vesuvius. In present day Italy, tunnels run underground where excavations have been performed and statues of Cira located.

The Skulls

Eve works on several reconstructions over the course of the book, including: Guilia/Cira, Ruth, and Lucy.

The Vesuvianite Ring

The ring that Aldo sends to Jane under the pretense that it was sent by a friend of the family. It is made of volcanic stone that has been cut and polished to resemble the gemstone peridot.