"We didn’t know who to trust."

Vietnam 1967: Military intelligence has collapsed, Viet Cong have infiltrated the clandestine American spy network, and the U.S. can't rely on the South Vietnamese. John Murphy, then an elite adviser, analyst, and operative for the Army, CIA, and South Vietnamese intelligence services, reveals the gray areas of critical, on-the-ground intelligence work, where trust is hard-won and easily lost.