Lost Art Press just released "Sharpen This" by Christopher Schwarz. It's their "pocket book" size, (like the Charles Hayward "Woodworker's Pocket Book" they published a while back,) and very short. I haven't received the book, but I'm sure it will be LAP's usual top quality paper & binding and all. They have a promo right now where you get a PDF if you order the book. I've downloaded and read that and thought I'd share some thoughts. (I'm bored, it's stupid hot, for here, and it's supposed to get much much worse over the next couple days.)
First, if you're on this forum you probably don't need this book. You probably already have a way to sharpen your tools. If you participate in sharpening threads on this forum, he explicitly avoids the nuance you thrive on. And, probably says something or other that'll piss you off!
That said, I think this is a really good intro to sharpening in general with specifics enough to make anyone successful with chisels and plane irons. He discusses what causes sharp and how to get there with a minimum of fuss. I think he fairly describes the general characteristics of different sharpening systems, but steers clear of recommending any one or specifics within a class. He instead advocates for mastering whatever you chose and evaluating the results you get. When the results fall short incremental improvement in technique is consistently his first step.
He closes with some appendices which touch on some things that are so often debated in sharpening discussions. This will make a novice aware of the possible nuances, but Chris argues they are secondary concerns and not important to achieving acceptable results for your projects. (He also says he doesn't mind if you want to make sharpening your hobby, though he implies he doesn't want you to try to convert him from working wood.) Personally I especially liked the point he made about steel types, that the ingredients are less important than the chef and quality of the preparation.
So, if you have a beginner to help, or a classroom to stock, I'd highly recommend this book. (But remember chisels and plane irons! There are other longer more comprehensive complicated books which cover other topics.) If you're passed the beginner phase, I hope I've given enough of a description you can make up your own mind.