At the beginning of the twentieth century, a few members of the Sisseton-Wahpeton Dakota community in northeastern South Dakota, while living in the white world, quietly worked to preserve the customs and stories of their ancestors in the face of federal government suppression and the opposition of organized religion.

Amos E. Oneroad, a son of one of those families, was educated in the traditional ways and then sent east to obtain a college education, eventually becoming a Presbyterian minister. For most of his life, he moved in two worlds. By fortunate coincidence he met Alanson...