It was hailed as the safest boat on the river, but when the Sobral Santos sank on a pitch-black night, it's said many of the passengers were eaten alive. The death toll ran into the hundreds and dwarfs all of angling explorer Jeremy Wade's previous investigations combined. So, what was to blame? A river this vast hides many dangerous secrets, and Jeremy will have to travel hundreds of miles to retrace the doomed boat's last voyage. On the way he faces adversaries, old and new, as he goes to extreme lengths to uncover what was behind the Amazon Apocalypse.