Scott Patterson does an excellent job of mixing entertaining stories with the history of electronic markets. Very good book.
If you liked Michael Lewis' Flash Boys or Scott Patterson's Quants, you will love this book!
Overall it is a very thoughtful book. Neural and comprehensive. Only dissatisfaction is that the author always put the machine at the opposite side of human being. But in the end, human being develop the algorithm and code the machine. Since there is no truly AI be ache curved so far, the high frequency trading is really just an intensive game between mortals.