This detailed yet concise textbook is a complete introduction to the law of international investment protection. With chapters on the sources of investment law, expropriation, treaty-based principles of protection, dispute settlement, and investment insurance, the text offers instructors a tool to use in its entirety or selectively, on its own or combined with other materials. Written principally for law students, the book contains numerous excerpts from many of the most influential arbitration decisions. This case-book style allows the readers to become familiar with reading opinions, whilst at the same time, the explanations accompanying the case materials eases the task of grasping the core reasoning contained in the decisions. It also makes the book suitable for non-legal readers interested in the processes and implications of mandatory state protection of alien property. The author's balanced handling of differing interpretations of investment treaty provisions leaves room for the reader to question majority approaches and form an informed opinion. The reader's understanding is reinforced by probing questions throughout the book, and 'Thoughts from an Expert' sections by renowned practitioners and scholars provide an interesting additional insight into the fast-growing area of investment law and investor-state arbitrations. Key features include: Balance of cases and explanatory comment familiarises students with reading opinions and enables them to grasp the core concepts at stake. Concise - suitable for one-semester course for non-specialists or as a first text for students who will take further specialised courses in the area. Excerpts from the most influential arbitration decisions outline differing interpretations and ensure students don't learn in a theoretical vacuum. Questions throughout encourage the reader to come to their own opinions. 'Thoughts from an Expert' pieces from renowned practitioners and scholars provide additional insight into the way things operate in practice.