It is the eleventh of the Jack Flanders adventure series, and combines elements of Americana and Old-time radio with metaphysical concepts such as Sufi wisdom and Tibetan Buddhism.
A mysterious woman, Nina, arrives and persuades Jack to come with her, leading him to a journey through the dream-like dimensions of higher realities.
and Jack's uncle, Sir Henry Jowls from The Fourth Tower of Inverness, and try to capture a large magical green stone - the source of the dangerous and infamous Dragon Lady, Madame Zee's power.
Jack persuades them to help return the green stone to the sacred city of Merkahbah - as his dreams have been telling him so to do.
Much of the voyage in Part Two, through the land of the Hungry Ghosts, is a re-working of Jack's last journey in The Fourth Tower of Inverness.
This relationship presumably occurred after the events of Moon Over Morocco where Layla appears to Jack and helps him.
There was a more malevolent Oolupi who tried (and almost succeeded) in seducing Jack during his travels inside The Fourth Tower of Inverness.