Glen and Bessie Hyde began their honeymoon trip down the Green and Colorado Rivers on October 20, 1928. A month later they hiked to the rim of the Grand Canyon resupplied, and returned to their boat. When they did not arrive at trip's end, Glen's father launched an exhaustive search of lower Grand Canyon. They Hydes' crude Idaho sweep scow was found in calm water, fully loaded. But Glen and Bessie had vanished without a trace. So began the greatest mystery in the annals of whitewater navigation. More than 40 years later, in 1971, an older woman on a Grand Canyon river trip announced she was Bessie Hyde. She said she had stabbed Gen, hiked out, and started life anew. In 1976 a skeleton thought to be Glen Hyde's was found at the canyon rim with a bullet in the skull. Since then, another suspected Glen and another Bessie appeared, further convoluting the myth of the Hydes. Author and boatman Brad Dimock searched the country for the true story of the Hydes. He followed each story and obscure lead to its end, even going to the extreme of recreating the Hydes' archaic craft for a harrowing trip though Grand Canyon with his own bride.