In the winter of 1952, at the height of the Korean War, the CIA flew a covert mission into China to pick up an agent. Trained on a remote Pacific island, the agent belonged to an obscure anti-communist group known as the Third Force based out of Hong Kong. The exfiltration would fail disastrously, and one of the Americans on the mission, a recent Yale graduate named John T. Downey, ended up a prisoner of Mao Zedong's government for the next twenty...