In this episode, Prof Mohammad Shahabuddin (University of Birmingham, UK) speaks with Dr Kalana Senaratne (University of Peradeniya, Sri Lanka) on  the latter's new book titled 'Internal Self-Determination in International Law: History, Theory, and Practice' (Cambridge University Press). In this book, Kalana invites the readers to rethink the history, theory and practice of internal self-determination in a complex world. Kalana shows that it is a principle of great, but varied, potential. Internal self-determination promises democratic freedoms and autonomy to peoples; but it also represents an idea which is not historically new, and is ultimately a principle which can be promoted for different and conflicting purposes. Written in a clear and accessible style, this book will be of interest to international lawyers, state-officials, minority groups, and students of law and politics.