"Traitor" is a denigrating term inconsistent the content of this book. Presumably the marketer's came up with the title to work in "Hitler" and a gratuitous slur on Rohm, who being a Nazi, and queer, was of course quintessentially evil.
The authors' well researched work conveys a heroic, ultimately tragic figure. They supply a rich context for that tragedy, with much detail I'd never read anywhere else. They make introductory bows to political correctness with obligatory defamation of Rohm's character. For example, after describing Rohm's remarkable bravery in battle and his extraordinary compassion for the soldiers he led, the authors offer the rationalization that "a man who knows no fear is not really brave" and the pathetically lame opinion that Rohm's concern for his men's welfare was because of his homosexuality. (So the converse is true? a hetero-sexual officer doesn't care about his men? blah). Thankfully, after the first chapter they drop the propaganda and get on with telling the pretty much untold story of Rohm.
The also book provides a very good history of the post Great War economics/culture/politics which led to the Nazi's ascension to power. And of course, much info about the SA. Prince Harry followed in the footsteps of a legion of aristocracy when he donned a brown shirt and swastika.
The authors access arcane sources and draw heavily (and somewhat clumsily) from Rohm's autobiography. They have put together, with unusual insight, an informative and well written narrative.