On February 13, 2003, a plane carrying three American military contractors--Marc Gonsalves, Tom Howes, and Keith Stansell--crashed in the mountainous jungle of Colombia. Dazed and shaken, they awoke covered in blood with automatic rifles pointing at their faces. As of that moment they belonged to the Colombian terrorist organization known as the FARC, American captives in Colombia's volatile conflict that has stretched over the last half century...