Suzanne Young's The Program and The Treatment duology is one of the most underrated series I've read. It's just so smart and insightful and just plain fascinating. And while that series closed with a very satisfying ending, I was thrilled when I learned that Suzanne was revisiting the world of the series with a prequel, The Remedy. 

(Hint: Read this entire post--there's an awesome giveaway sponsored by Simon & Schuster happening too!)