This book investigates the core question of how metacognitive processes, specifically worry and rumination, contribute to the development and maintenance of emotional disorders. Authors Adrian Wells and Peter Fisher, both established experts in the field of clinical psychology, present a framework that shifts the focus from the content of thoughts to the processes of thinking itself. By examining erroneous beliefs about cognition and maladaptive self-regulation strategies, the text provides a structured approach for clinicians to help patients interrupt repetitive thinking cycles that perpetuate psychological distress.

Clinicians and students frequently cite this work as a foundational text for understanding the distinct mechanics of metacognitive therapy. Experts highlight the clarity of the thirty-point structure, noting its utility as both an introductory guide and a reference for practitioners integrating these methods into their clinical practice.