Yossi Ghinsberg, an Israeli backpacker who, together with two friends, set off from the Bolivian city of La Paz on what was supposed to be the adventure of a lifetime. Leading the way into the uncharted Amazon was an Austrian expat named Karl Ruprechter, who had met the friends just days before and claimed to be familiar with the region. But their dream trip soon turned into a wilderness nightmare from which not all of the men returned.