I went straight into this book without knowing anything. I just knew that it was a thriller and the protagonist's name was Riddhi. Maybe because of that, I enjoyed the book even more. So I don't want to give you guys any spoilery hints on this. Just know that this story involves A girl named Riddhi who is suffering from cancer and having only last two years left in her life, she starts receiving anonymous letters and there begins the story. You see? Letters can be hell romantic but sometimes be bloody thrilling. The latter one plays an important role here. The only thing that could have been better is the development of characters and detailed description of what's happening around in a little slow pace. Those things would have made it a complete 5 star read. The climax was unpredictable and awesome. It's been long since I finished reading books in one sitting until this. It was such an un-put-downable thriller. And I definitely recommend it to you guys.