My faves have all been named already however, I do find that the following books - while not dedicated to Keto per se - do not contradict and have, in fact, been a fantastic complement to my keto-education.
Wheat Belly by Dr. William Davis
Grain Brain by David Perlmutter
Primal Body Primal Mind by Nora Gedgaudas
Primal Blueprint ( a whole series of books) by Mark Sisson
Toxic Oil by David Gillespie
Sweet Poison by David Gillespie
Iodine : Why You Need It, Why You Can't Live Without It by David Brownstein
The Art and Science of Low Carbohydrate Living: An Expert Guide to Making the Life-Saving Benefits of Carbohydrate Restriction Sustainable and Enjoyable By Voleck and Phinney
Also. Dr Daniel Amen's books
CHANGE YOUR BRAIN CHANGE YOUR LIFE
THE BRAIN WARRIOR'S WAY.
Because these books focus so much on the way certain foods can be damaging - and they just happen to be things that should also be eliminated to eat keto - it strengthened my resolve to stick with it. When I wasn't doing it for my blood sugar, or my pant size, I was doing it to be in good mental shape etc etc etc.