Guarded by hundreds of armed rebels deep in a malaria-infested jungle, three American captives pass the time playing with a homemade deck of cards and dreaming of their families. The threat of death always hangs nearby. The three U.S. military contractors have been cut off from the outside world since their capture by rebels seven months ago. That isolation was broken when a Colombian journalist traveled for days over rough roads and jungle rivers with a rebel escort to interview them July 25 in remote southern Colombia. "They were nervous, and there were traces of fear on their faces," freelance...