In addition to all the other recommendations, I recommend Blindsight. You can buy it where all good books are sold, or the author also gives it away on his website (https://rifters.com/real/Blindsight.htm) but considers it good form to send a donation his way if you enjoy it.
Blindsight was good, but really dense. I devour most sci-fi but had to read Blindsight twice before I had any confidence that I understood what was going on.