In this groundbreaking book, psychiatrist and neuroscientist Amir Levine and psychologist Rachel S. F. Heller reveal how an understanding of attachment theory-the most advanced relationship science in existence today-can help us find and sustain love. Attachment theory forms the basis for many bestselling books on the parent/child relationship, but there has yet to be an accessible guide to what this fascinating science has to tell us about adult romantic relationships-until now.