A good selection of books by George. I too found flash-boys a great education about the antics of HFT boys (and the banks as well). Michael Lewis is a very good writer.
If you want to read some fiction that also covers a different style of trading then you can read James Clavells book ‘Noble House’ about Hong Kong in the 60’s and the antics of the great trading houses. (It was turned into a TV mini-series in the 80’s starring a pre-James Bond Pierce Brosnan.)