Who on earth is the Holy Spirit? (Questions Christians Ask)

Many people find it easy to understand about God and Jesus, but struggle to understand quite how and where the Holy Spirit fits into the picture. Who exactly is he? And how does he work in our lives?
These short, simple books are designed to help Christians understand what God has said about these questions and many more in the Bible.
Suitable for all Christians - especially those who are struggling with questions about who the Holy Spirit is.