As a biography of Jack Daniel, this is sort of thin. As a look at Jack Daniel's whisky, it's sort of misleading.
The writing is clear and easy to read. And there is interesting information here. But whatever Jack Daniel's commitment to making high-quality whisky, the company that now makes the stuff isn't so committed. Jack Daniel's Old No. 7 may be the best selling Tennessee whisky there is, and one of the best selling whiskies in the world - it's certainly one of the most famous, if not the most famous - but it's nowhere near as good as some other brands. I'm an amateur, having been drinking whisky - for the first time in nearly 40 years, and for the first time with any attention to quality - only since September of 2021. But my first taste of Jack Daniel's convinced me that the stuff is awful, and I've since found much better whisky elsewhere. Yet the author makes it seem that the company today has the same high standard that (he says) Jack Daniel had. If it's the truth, then Jack Daniel turned out some atrocious junk, and if it's not, then either the author is a dupe or a deceiver.
Frankly, however interesting the book is, it strikes me as being in the nature of a puff piece for the distillery and the whisky it produces.