Glen and Bessie Hyde

Two young newlyweds set out in 1928 to conquer one of the most dangerous rivers in the world, chasing fame, adventure and a record that had proven impossible for everyone before them. Their handmade boat was later found upright and intact with their supplies neatly strapped in, their detailed journal still dry inside, and forty two notches carved into the wood marking each day of their journey. Yet the couple themselves had vanished without a trace, leaving behind only a final photograph, scattered footprints along the canyon and a mystery that has haunted explorers for nearly a century.