Whereas I did a fair amount of climbing as a young soldier - many years ago, my current interest in knots has been rekindled by a requirement to climb trees as part of the process of felling them.
My first reaction on seeing his book, however, was something of a disappointment because of its size. Thankfully, that was a false impression because I soon found the information I was seeking.
Altogether, the work includes clear instructions on sealing ropes after they have been cut, how to tie 19 important knots (with a further 16 variations) and how to use each of these in a safe and effective manner. The primary and secondary function of each knot is included along with details of joining harness to rope, rope to rope and rope to anchor.
Certainly not a comprehensive work by any means, nevertheless, it suited my own purposes and will undoubtedly be most useful to those who are at the beginning of whatever form of climbing they intend to pursue.
And good luck with that...