How to be at Peace with Your Choices. Life Lessons from the Book - The Midnight Library by Matt Haig. Between life and death, she enters a library called the Midnight Library where she gets to look at her Book of Regrets. She can erase those regrets by living those lives she had always wanted. In short, she can rewrite her life story and live various lives undoing her regrets. It's a very interesting take on regrets, being at peace with your choices, happiness and disappointments. Although it's a work of fiction, but there are life lessons in the book which are evergreen.