This book outlines the principles behind the international law of foreign investment, with the main focus on the law governed by bilateral and multilateral investment treaties. Legal principles are fully illustrated by many case examples, with particular consideration given to in-depth analysis of many important arbitral awards, producing a summary of the essential facts and reasons for decision of various ICSID, PCA and ad hoc investor state arbitral awards. Combining a systematic analytical study of the texts and principles underlying investment law with a jurisprudential analysis of case law arising in international tribunals, this book offers an ideal introduction to the principles of international investment law and arbitration for students, scholars, and practitioners alike.