David Charters has done a good job of a short story (which grew a bit, to almost half a novel size) of the pre-bonus period in an investment bank in the City of London. The one track mind lead character is a fair caricature of the breed portrayed and is likely to have a reader both despise him, as well as root for him (at least at some points) - at least if you have worked in a similar environment at some point in time. Otherwise the rooting might be a bit harder to bring yourself to do.
The author certainly does a good job of providing an entertaining read here, the mindset description being particularly well done (I will not pass judgement on its realism). Again I can imagine that someone with little contact with the business will probably come away more horrified than entertained and that there will be at least the odd cry of 'and such people are running our financial sector'?
While Charters provides an entertaining read and an interesting description, I find the book lacking somewhat compared to a classic like
Bombardiers by Po Bronson, which is simply on another level as regards energy, vibrancy, humour, etc. Not to say that this book is not to be read but you might find it somewhat flat if reading it after Bombardiers.
Finally, the book really is not quite a full novel at ca. 130 pages, with plenty of pictures to boot. It's a great fast read, in fact, unless you really have no time for reading, you should be able to finish it in one sitting.