There is an old joke that goes something like: "Put two economists in a room, and they'll come out with three opinions". Howard Davies, Director of the London School of Economics and well-known in the media, goes somewhat better: in separate chapters he considers no fewer than 38 opinions as to who is to blame for the 2007 world financial crisis, and in chapter 39 gives his own views about who is right. The book, which appears to have been completed just before the 2010 General Election, is not light reading, but presupposes a serious interest in, and understanding of, the complex issues involved. Each chapter is basically a resume of the reasons put forward for the opinion being discussed, with a list of references for further reading. Chapters 35-38, under the general heading "Wild Cards", discuss some relatively unconventional views, such as that proposed by the scientist Susan Greenfield that it is all the fault of video games, with which the younger members of the banking fraternity were brought up. These 4 chapters are probably more accessible to the reader unfamiliar with the complexities of the U.S. subprime market, fair value accounting, derivatives, hedge funds, and the many other topics discussed in the previous chapters. But for the initiated, and for those willing to learn, this is an excellent and comprehensive summary of the possible causes of a crisis about which the Queen, quoted on page 161 in a chapter about fraud, asked "Why did no one see it coming?".