There are really only two books about investment banking that I would recommend.  The first is Monkey Business: Swinging Through the Wall Street Jungle by John Rolfe and Peter Troob, published in 2000.  This is the tale of life as Associates at the investment bank, DLJ (later bought by Credit Suisse).  The second is The Accidental Investment Banker: Inside the Decade That Transformed Wall Street by Jonathan Knee, published in 2006.  Knee shares some of his experiences mostly as a senior banker (Managing Director) while employed at Morgan Stanley and Goldman Sachs.