best chess book on a specific opening

This is not meant as "What's the best opening and how do I learn it?"

I would like some opinions on books that you feel describe a specific opening very well. 

An example would be like "I prefer to play the French against 1.e4 and I found that 'French Toast' by GM Francois Somebody is an amazing introduction for someone wanting to learn the main ideas behind it."

I have never really studied the opening very much and kind of just meander about. I feel like I should just learn an opening or two at a decent level and be done with it, at least until I'm much stronger in other areas of the game.

A few openings I have played with recently are the English for white, and the French and Slav for black. Way back when I first started playing, I really liked the King's Indian Defense, and I'm considering getting back into that, but I'm not sure.

Thanks in advance.

If you have little time to devote, as stated in your profile, you should really work on every other part of the game (especially in tactics and endgames) and leave openings at peace for now.

Thank you for taking the time to give some advice. I think my profile is a tad outdated - I have been giving myself between 30 minutes to an hour every weekday for chess, and about an hour or two each day on the weekends. My goal is to compete in a few tournaments this year. I haven't played much OTB and I feel I'm a little behind in that regard.

Perhaps researching Chess Openings Move by Move will benefit ye

The Chigorin According to Morozovich.

My friend scoured the Earth looking for this book.

Then he lent it to me. Then he passsed away before I could return it. (Which sucked beyond belief)

So now I guess I gotta start playing the Chigorin.