Solitude in an underground medical complex, tied to a pole embedded deep in the ground, did little to quell the cavorting demons in Captain David Hanson's mind. Less than a year agao he had worked twenty-hour days in his second year of surgery residency. Now a POW in South Vietnam, he whiled away the long empty hours watching insects burrow into the earthen walls. Two things prevented total insanity: friendship with his enemy, a surgeon, Major Duc Phan Thiet of the North Vietnamese Army, and the never-ending desire to escape. The first was improbable and the latter impossible.