In this Introduction to the book, I raise the question of the possible erosion of prohibitions on assassination, torture, and mercenarism. I discuss the limits of ‘norm death’ as an explanation and propose instead that a ‘normative transformation’ has occurred. I outline how pragmatism, practice theory, and relational sociology will inform my perspective, how I will critique and build on theories of norm change in IR, and how I will analyse the three cases: the USA’s targeted killing programme, the CIA’s detention and interrogation programme, and the USA’s extensive employment of armed contractors in war zones.