I've told this story a number of time, but the meeting I had with this book really opened my eyes to gaming. I read this book so many times that I ran it for people at a birthday party just a few days later.
From that day forth, there was no going back. I knew I was not alone in the world thinking of these kind of things.
My parents despaired.
The story is fairly classic: evil wizard in a tower, go and take him out. There are a number of really fun, nasty traps and the typical types of combats you find in these books. Fun. Fun. Fun.
As I was writing this, I managed to find a cheap copy of it on Ebay. Guess what. It is now mine!
PS: My wife will kill me for going on Ebay.