The protagonist's discovery of Priya occurs after he investigates her connections to the arms trade and the mysterious inverted materials. Initially believing Priya to be an antagonist, the protagonist infiltrates her Mumbai penthouse to confront her. However, during their meeting, Priya reveals that she is a key member of the TENET organization and has been working against Andrei Sator. She provides the protagonist with critical information about Sator’s operations and the Algorithm, helping him understand the larger scale of the time inversion threat. This revelation shifts the protagonist’s mission and alliances as he moves deeper into the world of TENET.