On the complicated journey of life, they provide constant guidance-keeping us on the predetermined path we have chosen for ourselves. But what exactly are spirit guides, and how much of a role do they really play in our existence?

Up until recent years, author D. L. Kline would have insisted the concept was just a sign of an overactive imagination. But since the spiritual awakening that changed the course of his life, he has been in close contact with the spiritual forces that guide his path-and in particular, his primary spirit guide, who goes by the name Jasper.

Now, in "The...