It's incredible how well this book understands and embodies the Planescape setting. It genuinely seems like Gardner has a better understanding of the setting than the current custodians of the IP.
It could be my love of Planescape and Sigil speaking but this is eclipses a lot of other official licensed D&D novels.
The story itself follows a fairly typical fantasy adventure format, there's even an unneccesary bitter sweet romance that has the grace to not overstay its welcome. The thing that sets it apart and kept me glued to the page was how it brought the world to life. Gardners rendition of the manic atmosphere of Sigil and the planes is something I took great pleasure in exploring. An unexpected surprise was the undercurrent of very mature themes sprinkled throughout Fire and Dust. A word of warning, this story goes to some very dark places... and I'm not talking about the Negative Energy Plane.
It's certainly not a masterpiece or even something I'd recommend to every blood and berk, but by the Lady, this was a fun read!