Though never believing the stories to be true, the legend of the lost city stuck with him into adulthood. Years later, as a geothermal scientist, Ruzo decided to investigate. To his surprise, he discovered an incredulous river deep in the Amazon, with water hot enough to kill a human. Historically a place of pilgrimage for shamans and sorcerers, the river now faces increasing threats from poachers, loggers and squatters. Now, Ruzo is working hard to protect it.