I recently read American Assassin by Vince Flynn and this book is amazing. I love how it is full of twists and turns (a real page turn so to say). The story is based on an undercover CIA spy that due to events in his past, has no fear for anything. Mitch Rapp the main character is out for revenge and the story takes you through his new career with flashbacks. This is  a must read if you love a good action packed story with a lot of mystery. I purchased my copy here American Assassin on amazon.com