I read this book when I got my first job doing server support for a Wall Street trading floor. I didn't know anything about the markets then, yet this was an easy-to-understand introduction to the world of trading in the form of a very interesting novel. Now that I've been in the industry for a while, I think I'm going to read it again to see what I didn't pick up the first time. This is a very enjoyable book.

If you don't mind reading books online, this book is available for free viewing via google books: books.google.com/books?id=HT5c4rPK59EC