This book investigates the developmental stages of romantic relationships and how therapists can diagnose and treat the specific conflicts that arise when partners fail to mature together. Authors Ellyn Bader and Peter Pearson, both clinical psychologists, utilize their extensive experience in couples therapy to present a framework that views relationship struggles not merely as communication failures, but as developmental impasses. They argue that partners often seek a 'mythical mate' to complete them, and the book provides a structured approach to moving beyond this fantasy toward a more differentiated and sustainable partnership.

Experts in the field of marriage and family therapy frequently cite this work as a foundational text for understanding the intersection of individual development and relational dynamics. Practitioners often note that the clinical framework provided is highly practical for addressing complex power struggles and intimacy issues in a therapeutic setting.