My family came to Cassia County in 1879 when my forebearers, the Cummins and Severe families, settled in Oakley. I grew up in the area and am the seventh generation to have called the Magic Valley home. One of the victims, Daniel Cummins, was the nephew of my 3rd great grandfather Frances Marion Cummins. Consequently, I grew up with relatives who thought Diamondfield Jack's pardon was a serious injustice.
Grover makes two significant errors and two significant omissions that deserve mentioning. First, is the constant misspelling of the family name. It's Cummins (like the engine company) not Cummings. This is a common error I have encountered in the history of the Deep Creek homicides. The book refers to Dan's clothing being given to "T.M. Cummings." It is actually F.M. Cummins, my grandfather (p.30). Grover quotes, without citation, "Frank Redke" calling Oakley a "hot bed of Mark Hanna," a reference to William McKinley's campaign manager and a way of saying the town was a Republican stronghold (p. 116). That is actually Frank Bedke, an early Cassia County cattleman of Prussian extraction who was a prominent Democrat. The Cummings error is common, but the "T.M." and "Redke" errors suggest sloppiness and unfamiliarity with Cassia Counties pioneer families.
Two notable omission also concern relatives of mine. The second elected Cassia County prosecutor (who undertook a halfhearted prosecution Gray and Bower after their confessions while Diamondfield awaited execution) was Benjamin P. Howell. His wife Josephine Howell (referenced on p. 117) was the daughter of F.M. Cummins. Howell almost certainly became a lawyer as a direct consequence of homicides. According to family records he was sworn into the bar days after Diamondfield's verdict in April 1897. The halfhearted prosecution of Gray and Bower likely was because Howell the rest of the Cummins family still believed in Diamondfields culpability. J.J. Gray (referenced on p.40 as a sheep man who was part of the posse accompanying the sheriff to carryout Diamondfield's requisition from Arizona) is John Joseph Gray the husband of Goldie Gray, another daughter of F.M. Cummins. Obviously the general animosity between sheep herders and cattleman grew to fever pitch at the time, but it is underdiscussed the desire for accountability and vengeance from a prominent Cassia County affected events.
In all, the book is a fascinating, quick read that brings some of the most important figures of the Old West to my native Cassia County. However, given the impressions and omissions, I would read it with Max Black's more recent treatment of the Diamondfield Jack story.