Cynthia is also involved in the quest The Secrets of Loc Muinne. This is a new quest added in the Enhanced Edition, and only available on Iorveth's Path. Upon completing the quest, Cynthia can become a sexual partner for Geralt.
Philippa Eilhart's preferences in partners were widely known, yet they were audibly commented upon only in a specific circles, and only when the sorceress could not hear. Cynthia was Philippa's lover at the time – not the first one, and probably not the last.
As it turned out, Cynthia was also a spy for the Nilfgaardian Empire. However, those who could have stopped her saw through her games too late.
Geralt had not expected to run into Cynthia again, let alone in such an unusual place. But he did. The Nilfgaardian was leading a scientific expedition that was to explore the caverns beneath Loc Muinne. Their objective was to reach the laboratory of the famous mage Dearhenna.
Throughout their quest beneath the city's ruins, Geralt had remained wary of Cynthia - and for good reason. Yet as they worked together to overcome mortal danger, the ice between them melted. When a quarrel broke out over Dearhenna's legacy, the sorcerer Adalbert wanted to kill the witcher. Cynthia, however, took Geralt's side.