Tarus – Tarus I, Tarus II, and Tarus III have been mentioned throughout the series.
- Roarke was in the middle of his delicate negotiations with a pharmaceutical company on Tarus II. He intended to buy them out, revamp their organization, and link it with his own company based on Tarus I.
- Dr. McNamara had just returned from a consult session on Tarus II in Seduction in Death when Eve questioned him.
- Tarus Three was where Roarke located and murdered Michael Rowan.
- Nadine Furst mentioned Tarus III in Witness in Death.