Plenty of fad diet books won't help you achieve lasting weight loss. Instead, take inspiration and direction from books that provide ideas on how to change your lifestyle.
$6: "Eat to Live: The Amazing Nutrient-Rich Program for Fast and Sustained Weight Loss," by Joel Fuhrman (Kindle edition: $10) -- Amazon.com
$15: "Wheat Belly: Lose the Wheat, Lose the Weight, and Find Your Path Back to Health," by William Davis (Kindle edition: $9) -- Amazon.com
$24: "Practical Paleo: A Customized Approach to Health and a Whole-Foods Lifestyle," by Diane Sanfilippo, Bill Staley and Robb Wolf, (Kindle edition: $10) -- Amazon.com