After spending several days in Shanghai, Carter learns that Po-Choy, Fan Su's half-brother and a fellow ringleader of the underground movement who had infiltrated the Red Guard, has been captured and tortured by the Red Guard. To prevent him revealing any information that might compromise the mission Carter and Fan Su kill Po-Choy as he is paraded at a Red Guard rally. Carter and Fan Su escape from Shanghai with the assistance of a CIA-operated Civil Air Transport plane which takes them deep into China yet still 500 miles from the Chumbi valley.