The spirit is not well known in The Church of Jesus Christ of Latter-Day Saints. It is not the Holy Ghost, but is what the Holy Ghost is made of. This book goes over what the spirit is from scripture and also how to identify it.
Where does The Spirit of God rank among all the audiobooks you’ve listened to so far?
It is one of the best LDS guide books there is. I would prefer the audio version rather than the print version.