Zane Grey was an American author best known for his adventure novels and pulp fiction that glamorized the Old West. In the introduction to this novel Grey explains that the brutality of this story is not meant to shock the reader, but to accurately depict life on the frontier. The story tells of two brothers, one a missionary and the other a newcomer to this untamed region. Although an historical novel, Grey uses real people to tell this story of the American border rangers. .