This is not an easy book to classify and, despite the very best attempts of the editors, one may wonder if it appropriately labelled an ‘introduction’ to anything, let alone an introduction to ‘Christianity and International Law’. This inevitably sounds like a damning criticism—but it is not intended as such. Rather, and as the editorial introduction makes clear enough, what exactly is meant by both ‘Christianity’ and ‘International Law’—let alone ‘Christianity and International Law’ (cf 11) - for these purposes, remain somewhat inchoate. In a sense, however, this appears to be a part of what this book is about. Rather than being an ‘introduction’ to a discrete field of investigation, the book is the field of investigation. And it is in this sense that it may be understood as forming an ‘introduction’; as being an introductory exploration into the many and varied ways in which Christian thinking has contributed to...