Flash Boys is accurate in the important details. Do your own research and you'll learn that a) HFT is one of the most interesting topics in the news today and b) a lot of pro-Wall Streeters love to straight-up lie about it, or maintain that HFT is the solution to a problem that doesn't exist. Good book. One of the very few readable books about the modern opaque financial world, but I can recommend a couple more if you want to hate the subject.
You're a techie yourself, right? Lurk around Nuclear Phynance, it's where people working on trading algorithms hang.
http://www.amazon.com/gp/product/0307887189?Version=1&entries=0 -- quite good, more specifically about hft/electronic trading http://www.amazon.com/Demon-Our-Own-Design-Innovation/dp/0470393750/ref=sr_1_1?s=books&ie=UTF8&qid=1443489307&sr=1-1&keywords=demonofourowndesign -- interesting history that i found all but unreadable and then there's the rest of lewis' output, which is pretty much essentially reading. especially the big short