Adrenaline-junky Simon Newman sneaks onto private land to explore a dangerous cave in Wales with a strange man he's met online. But Simon gets more than he bargained for when the expedition goes horribly wrong. Simon emerges, the only survivor, after a rainstorm trap the two in the cave. Simon thinks he's had a lucky escape. But his video of his near-death experience has just gone viral. The perfect thriller for fans of John Krakauer's "Into Thin Air".