A high quality product that is quite unique, and also a poorly organized adventure with gaping plot holes.
I docked a star because there is no adventure summary, so as a GM you will have to slog through the entire 100 page book in order to assemble a coherant outline.
There are several plot glitches on top of the lack of a summary; for on, a key that is pr
omised to be accessable 'at several locations' is nowhere to be found. Be prepared to spend 4-6 hours working up an outline and notes in order to GM this coherantly, and be prepared to to fill in some gaps.
For some reason the author descided to waste several pages setting up a randomizing feature 'for replayability', which really seems dumb. Worse, this creates several unpredictable paths to the end, and requires even more GM work.
Finally, the end battle is terrible. I docked a star for that. The bottom line is that the PCs have little or no impact upon the outcome of the adventure; in fact, if you use the random feature, the adventure may be completely unwinnable from the onset.
If you are a veteran GM willing to log the time, this project can be salvaged and made into something better.