Watch full movie online. Glen Culbertson is a professor of Native American studies at Western University.He holds a map to an ancient burial site shrouded in mysterious legend.His only problem is he needs an Indian guide to take him on the reservation in secret to find it.The River Runs Black takes you on a suspense filled back country trek where all is not what it seems and where disturbing the dead has dire supernatural consequences.Some things are better left buried.