It is near 900 pages on the topic of how to define and write a routine. It is very-well written, with funny "coding horrors" section, covers multiple languages (hopefully not in the "how to do xxx with language yyy", repeat for all yyy publishing crazyness).
My experience is that it can boost the coding style and efficiency of beginners dramatically (the size is a little intimidating, but once they start it they finish it). Experienced coders won't learn much, but it's nearly all the topic covered in one book which is nice.
Warning: not to be confounded with "Writing Solid Code : Microsoft's Techniques for Developing Bug-Free C Programs" by Steve Maguire which is nowhere near the same quality and interest.