Book on Finance? (financial markets, investment)

Anyone know of any good book that explains how financial markets work? Stocks, bonds, Wall Street, etc. I finished reading an economics textbook and I got really interested in the corporate finance part of economics. Does anyone know of a good introductory book on corporate finance? Textbooks would be good since they are written to teach. Amazon had way too many to pick from, and a lot seemed way too specific.

Thanks!