Written by leading philosophers and lawyers from the United States and the United Kingdom, this collection of original essays offers new insights into the doctrines that make up the general part of the criminal law. It sheds theoretical light on the diversity and unity of the general part and advances our understanding of such key issues as criminalisation, omissions, voluntary actions, knowledge, belief, reckelssness, duress, self-defence, entrapment and officially-induced mistake of law. The book will be of interest both to established scholars working in the field of criminal law theory and to those coming to the subject for the first time.