In "How to be a Rogue Trader" Financial Times journalist John Gapper discusses various rogue traders from Nick Leeson to Kweku Adoboli, examining the traits that caused them to gamble in the way they did and why the banks they worked for did so little to stop them. His argument is that the banks themselves operate in the same way, with massive losses down the line being inevitable.
More a long article than a book "How to be a Rogue Trader" is an enjoyable read. It gives a good overview of the subject with lots of food for thought which can be followed up using the bibliography. As with most writing on financial trading, I found some concepts completely impenetrable despite the glossary at the end (as Gapper points out, it was this impenetability that allowed many rogue traders to conceal their actions). I also would have liked to know more about what prompts rogue traders to start acting irregularly in the first place.