In an era where government transparency and accountability are considered fundamental values, does Cabinet secrecy still have a place? Behind Closed Doors is the first comprehensive exploration of the legal and political rules protecting the confidentiality of collective decision-making at the highest executive level of the Canadian state. Yan Campagnolo defends Cabinet secrecy as essential to the proper functioning of responsible government while criticizing its associated statutory provisions as excessively broad and possibly unconstitutional. Comparing Canada, the United Kingdom, Australia, and New Zealand, this meticulous work proposes feasible, specific reforms that would achieve a better balance between transparency and confidentiality.