Not exactly darkroom, but it is related in the fact that it address exposure and development, so that you control the process, all trough the darkroom and onto the final print.
It's called "The practical zone system" and is a very user-friendly approach to explaining the zone system for your photography, good illustrations as well.
Explains exposure, EV's, zone system etc in a very neat and understandable way, it also has charts and photos to get the points across, highly recommended over the Ansel Adams books.

- You can read those later, if you want to prefect the zone system use, but IMO the practical approach is a better way to get started.

http://www.amazon.com/Practical-Zone.../dp/0240817028

I have read "Way beyond monocrome" (most parts of it anyway) and it really is a great book, it has "everything" and is written in a way that you can actually understand and go ahead and use.