Rather than being about Daniel Plainfield and to a lesser extent his "son" HW, the book is told mainly from the perspective of "Bunny" Ross, the actual son of oilman J Arnold Ross. There are very significant roles for two of the Watkins brothers: Eli the Pentecostal preacher, corrupt as in the film, but more believable here to those who know something of Pentecostalism in 1920s California (some of the material clearly influenced by the career of Aimee Semple Macpherson); and a very prominent role for Paul, the politically committed union activist who ultimately becomes a communist, and has a profound influence on "Bunny".
Why three stars? Well, for me three stars means averagely good, four stars is for significantly better than average and only the truly exceptional should get five stars. There is much to admire and enjoy here, but it was written in 1926, and the author's advocacy of socialism/communism, with his enthusiasm for communist Russia seems hopelessly naive and misplaced, given what we have known for many decades now. Human greed is an evil thing, and the capitalist beast needs taming, but communism proved a worse system than America in the 1920s in virtually every respect.