Biologist and freshwater detective Jeremy Wade continues his year of Amazon exploration, investigating three mysterious deaths in three separate countries: Peru, Colombia and Brazil. The bodies have been recovered with bizarre injuries, the likes of which Jeremy has never seen before. In a bid to get to the truth, Jeremy embarks on his most remote mission yet, crossing dangerous borders and passing through the territories of warring tribes to live with the Matis, a mysterious, secretive tribe, deep in the Brazilian Amazon. Can they get him closer to the terrifying ...