A riveting journey down Theodore Roosevelt's "river of doubt" with a diverse crew of adventurers, scientists, and Indigenous leaders who shine light on the past, present, and future of a natural wonder. Sam Moses took part in the adventure of a lifetime when he, along with seventeen men and two women, embarked on the Rio Roosevelt Expedition. They would follow the former president's wake down five-hundred miles of extreme whitewater into the dark heart of the Amazon. The party was guided by two chiefs from the Cinta Larga tribe—the same tribe that stalked Roosevelt’s expedition in 1914—who, between rapids, tell the story of the tribe’s own Trail of Tears. After the wildest whitewater is past, Moses travels with the chiefs to their village to witness the massive illegal mahogany logging from their forest, the Roosevelt Indigenous Territory. River Without a Cause puts us in the raft during those heart pounding rapid descents, as we experience the drama, dynamics and disputes between the Bull Moose and his co-leader, Brazil’s most famous explorer, the rigid Colonel Candido Rondon. As the Amazon stands on the precipice of hope with the election of a new Brazilian president, River Without a Cause is a moving and galvanizing tale of adventure that is a fitting tribute to this world wonder.