Young Israeli, Yossi Ghinsberg (Daniel Radcliffe), leaves a safe future behind to chase an improbable dream in the mysterious depths of the Amazon rainforest. For a year, he journeys on the path well-traveled, but when he and two new fellow adventurers, Kevin Gale (Alex Russell) and Marcus Stamm (Joel Jackson), meet the darkly charismatic Karl Ruchprecter (Thomas Kretschmann), and follow him into the jungle, what begins as the realization of a dream soon turns into a harrowing psychological test of faith and fortitude. A true story of survival against all odds, based on the international best-selling memoir by Yossi Ghinsberg.