Jens Timmermann is the Professor of Moral Philosophy in the University of St Andrews. He is the author of Kant's Groundwork of the Metaphysics of Morals: A Commentary (Cambridge, 2007) and Kant's Will at the Crossroads (2022) and the editor of the German–English edition of Kant's Groundwork (Cambridge, 2011).

'Timmerman confronts the mysteries of Kant's notorious little essay with philosophic rigour, historical insight, and a relentless commitment to illuminate Kant's ideas on their own terms. This book is a remarkable achievement.' Jacob Weinrib, Queen's University

• 1. Introduction; 2. Kant's Duties of Truthfulness; 3. The Story of Kant's Essay; 4. Theoretical Foundations, Supposed Solutions; 5. The Intricacies of Constant's Example; 6. A Right to the Truth in Another?; 7. Form and Matter; 8. Kant's Argument against Constant; 9. Luck and the Imputation of Harm; 10. What Kant Should Have Said.

Jens Timmermann is the Professor of Moral Philosophy in the University of St Andrews. He is the author of Kant's Groundwork of the Metaphysics of Morals: A Commentary (Cambridge, 2007) and Kant's Will at the Crossroads (2022) and the editor of the German–English edition of Kant's Groundwork (Cambridge, 2011).

'Timmerman confronts the mysteries of Kant's notorious little essay with philosophic rigour, historical insight, and a relentless commitment to illuminate Kant's ideas on their own terms. This book is a remarkable achievement.' Jacob Weinrib, Queen's University

• 1. Introduction; 2. Kant's Duties of Truthfulness; 3. The Story of Kant's Essay; 4. Theoretical Foundations, Supposed Solutions; 5. The Intricacies of Constant's Example; 6. A Right to the Truth in Another?; 7. Form and Matter; 8. Kant's Argument against Constant; 9. Luck and the Imputation of Harm; 10. What Kant Should Have Said.