One victim, found dead on a London street. Four detectives, in four different time periods, must solve the mystery to protect Britain's future.

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.