Mastering is the phase in the recording process after the final mix has been made, but before the actual full scale duplication (release). If you are interested into Mastering or you never had any real guidance while performing the job, this small book covers a lot of valuable information.
It discusses how to clean up the final mix of a song (removing clicks, repositioning pieces inside the song, after processing (EQ, FX) of a song, combining songs to a balanced album...etc). He doesn't forget to concentrate on the actual process of listing and judging to the results and how to make a good working environment. An additional chapter explains important details for making a production master tape/disc.
What I really liked about the book is that it is up to date (cd-r, hard disc editing) and that it covers many small details (audio carries, Test tones etc.). I would like not to forget to mention the fact that, The BASIC series all have small overlaps, because they cover close related area's. This makes them all independ from each other, so you don't need to buy the whole serie to have the complete information on a certain area. Of course you will have some information double if you several books from this serie. Although I didn't find this annoying.