A thorough, systematic study of the Holy Spirit and His work by Dr. L. Thomas Holdcroft.
For those who want a deeper, more complete understanding of the Holy Spirit. This book is a bit more theological, but is still easily understood.
This work is used as a Bible college text book in many schools and is considered to be one of the finest Pentecostal-Charismatic resources on the Holy Spirit.
Back cover reads:
"The Holy Spirit systematically proceeds through a complete study of the Holy Spirit's person and work. The book is primarily an exposition of what the Bible teaches on this vital subject. It includes, however, a review of historical backgrounds, and it deals with current concerns and isues relating to the Spirit's ministry."