The book's content is less ambitious that its titles suggests. It is about how a team of derivative experts at J.P. Morgan contributed to the development of the securities, including credit default swaps and options, which led to the financial crisis. That's reasonably interesting, but it's a fairly narrow perspective on what happened. The collapse of Lehman is covered in a few pages. She doesn't even mention that the major banks were manipulating Libor. At points it sounds like she is writing to protect her sources. There is a lot about what a great CEO Jamie Dimon is at JP Morgan chase. She says the JPM team shouldn't be blamed for other banks misusing the derivatives they created. I've never heard anyone blame them for it.
There are a few mistakes: the internet bubble of 1999 was equity driven, not debt fueled. She uses acronyms too often, and there are no anecdotes explaining why the subprime default rates were so high. Indeed, she is very light on what happened in the subprime sector. The corruption there could have really livened up her book, and illuminated the causes of the crash. I learnt more about the crisis from the introduction to Niall Ferguson's Financial History of the World.