Great book detailing how High Frequency Trading (HFT) is scalping ordinary investors, penny by penny. What The Big Short (Lewis' last book) did for the bond community, this books does to the stock/equity community. You do need a basic grasp of investing concepts and lingo to understand what Lewis is describing, but he does use easy to understand examples to illustrate how HFT works. Much of HFT happened during the time of the subprime mortgage bubble, but came more to light after the post-bubble burst consequences had subsided. Now I just want to read all of Lewis' back list. 5 stars.