One book isn't enough, though I would encourage you to read the following;
Reminiscences of a Stock Operator - Edwin Lefevre
Studies in Tape Reading - Richard Wyckoff
Enhancing Trader Performance - Breet Steenbarger
Trading in the Zone -
Mark Douglas
You should be aware however that if all you do is read books about trading rather than actually trade, you'll become little more than a knowledgeable amateur. I refer you to an entry in DbPhoenix's blog regards the practice of becoming a trader;
http://www.traderslaboratory.com/forums/blogs/dbphoenix/36-the-trading-log.html