Master of the Jinn by Irving Karchmar

Exquisitely beautiful, highly recommend this one!
"Here is a tale set on the Path of the Heart, a mystical adventure wherein a modern-day Sufi master sends seven companions on a quest for the original Ring of Power, and the greatest treasure of the ancient world - King Solomon's ring. It is the very same seal ring of a hundred legends, given to King Solomon by God to command the Jinn, those terrifying demons of living fire."

The Spy of the Heart by Robert Abdul Hayy Darr

This is a beautiful book and I highly recommend it. The author spent five years traveling in Afghanistan bringing medicine, food, and other aid to refugees. He helps the reader to understand the politics there as well as Islamic spirituality in clear, and simple language.  Several times in his journeys he sits with Sufi teachers and these beautiful meetings are movingly described. Four of the chapters are available on the author's website or you can order the entire book.