Invented Eden: The Elusive, Disputed History of the Tasaday

In 1971 Manual Elizalde, a Philippine government minister with a dubious background, discovered a band of twenty-six "Stone Age" rain-forest dwellers living in total isolation. The tribe was soon featured in American newscasts and graced the cover of National Geographic. But after a series of aborted anthropological ventures, the Tasaday Reserve established by Ferdinand Marcos was closed to visitors, and the tribe vanished from public view.

Twelve years later, a Swiss reporter hiked into t...