Throughout their history, the A:shiwi people have made a pilgrimage through the Grand Canyon to leave offerings at traditional sites, gather materials for their cultural practices, and visit the place where their ancestors first emerged from the four Underworlds and into the light of day. Follow the A:shiwi rain priests and medicine men as this sacred migration down the Colorado river is documented on film for the first time – from the pueblo at Halona Idiwana’a to shrines and ancient settlements, through canyon walls carved by the petroglyphs of the ancestors.