San Francisco is abuzz with anticipation for the debut of a new production of Puccini’s opera, Turandot. The tale of the enigmatic Chinese princess Turandot and her three riddles, which hold the secret to winning her heart, is captivating opera enthusiasts across the city. Meanwhile, a serial killer is targeting the city’s gay bars, preying on long-term HIV-positive survivors. Stefan, a young gay medical student from East Germany, arrives in San Francisco for a medical conference, tracing the legacy of his deceased father, a prominent AIDS researcher from the East. Stefan is delving into the possibility that the HIV virus emerged from covert human experiments conducted in U.S. prisons during the 1970s—a theory proposed by Berlin professor Jakob Segal and disseminated by former East German state agents. Rumors suggest that confidential documents related to these biological experiments have emerged in San Francisco.