Legendary archeologist Johan Reinhard spent his career searching for the lost temples of the Inca Empire, discovering all but one: Ausangate, named after one of the most sacred mountains in Peru. Now in his seventies, he's handed the torch to environmental scientist Preston Sowell, who makes a mysterious discovery at an alpine lake near Mt Ausangate that he believes is the lost temple. This film follows Sowell's journey of discovery, loss and adventure as he seeks the truth about this sacred place.