On Easter Sunday 1967, the most famous American in Southeast Asia went for a short walk in the Malaysian hill station of Cameron Highlands and disappeared, as thoroughly as if he had been taken up into the air and vaporized. In the intervening 44 years, no trace has ever been found of the then 61-year-old Jim Thompson, a onetime OSS and CIA agent who became known as the Silk King of Thailand. The disappearance has become one of Asia’s enduring mysteries. It is one of the most complete evaporations ever recorded. Nor has Joshua Kurlantzick, a Fellow at the Council on Foreign Relations in New York, been able to come any closer to finding him.