From the back:
"It begins the night a dragon falls on an off-duty adventurer. Fortunately, it's a small dragon. Unfortunately, it's connected to a big problem. Make that a huge problem: The survival of a well-known wizard belonging to the Circle of Five is at stake, but that's not the worst of it. Evil forces are attempting to infiltrate a secret fortress and unlock vast magical powers, but that's not the worst, either.
The bad news? Some old enemies of civilization in the Flanaess have returned, and they've discovered a mutual interest in world domination. They have a plan to bring it about. And their plan is already underway when the little dragon appears.
Worse, on this particular nights, there's no one who can stop them - no one but any heroes who can start this adventure and survive through its out-of-this-world climax. And they have no choice. It they fail, the City of Greyhawk and all the civilized lands of the Flanaess will get to meet some remarkable legendary figures.
Then civilization will die. Screaming."