Ethan Kross's Chatter explores the nature and impact of the internal monologue, detailing how negative self-talk ("chatter") affects mental and physical well-being.

The book examines various research studies on internal dialogue, including those exploring the neurological effects of negative thought patterns and the benefits of techniques such as distancing and self-compassion. 

Kross also discusses the role of external factors, like social support and environment, in managing inner voices.

Finally, the book offers practical tools and strategies to help readers control their internal narratives and reduce the adverse effects of chatter.