The author, Christopher J. H. Wright, covers the Holy Spirit as a creating agent (Gen 1:2, e.g.), as the one who empowers the people of God, especially leaders such as Moses, Saul, and David, as a prophetic spirit who inspires the prophets, and as an anointer. In each section, he fills the pages with more scriptures than you would typically hear in one sermon.
The last section, on the coming Spirit, leaves me a little unsettled, not certain if what I am hearing is truth stated a little differently than I usually hear or perhaps a few things that might not be truth at all. Be careful there. But the rest of the book is one huge education in the work of the Holy Spirit all the way back to the beginning. As with the others in this series, the author has some strong words for those who would take advantage of people with their unsound use of the scriptures, a refreshing change from many theological books.
This book is published by the InterVarsity Press, and is also available in a three in one volume, which could save you some money. It is also available on Kindle.
Dene Ward