A Scottish orchid farmer visiting her ill sister in Bogotá, Colombia, befriends a young musician and a French archaeologist in charge of monitoring a century-long construction project to tunnel through the Andes mountain range. Each night, she is bothered by increasingly loud bangs which prevent her from getting any sleep.
In 1981, an enthusiastic young adventurer follows his dreams into the Bolivian Amazon jungle with two friends and a guide with a mysterious past. Their journey quickly turns into a terrifying ordeal as the darkest elements of human nature and the deadliest threats of the wilderness lead to an all-out fight for survival.