Bittersweet by Susan Cain

From the author who brought us the bestselling Quiet – a book that revolutionised how the world sees introverts – comes a new release that will alter your perception of the world. Bittersweet explores the idea of embracing the title notion – a tendency to feel a sense of longing, poignancy and sorrow. Think revelling in sad music or finding comfort in a rainy day. Cain shows how a bittersweet state of mind is the quiet force that helps us find creativity and connection. Bittersweet by Susan Cain (Penguin, £20)