Mel Robbins's The Let Them Theory is a self-help book exploring a method for managing stress and improving relationships.

The core concept, "Let Them + Let Me," encourages readers to release control over external factors (Let Them) and focus on their own responses (Let Me).

Robbins supports her theory with scientific research and personal anecdotes, illustrating its application in various life areas, including work, family dynamics, and romantic relationships.

The book provides practical tools and strategies for readers to gain control over their emotional reactions and create more fulfilling lives. It emphasizes the importance of self-acceptance and personal responsibility in achieving happiness and success.