Grounds of Judgment is a very interesting history of extraterritoriality in China and Japan. Cassel has done lots of research from primary materials in China, Japan and the UK. He has particularly explored the mutual extraterritoriality agreed between China and Japan before the Treaty of Shimonoseki (1895) as well as the early workings of the British Supreme Court for China and Japan as well as the Mixed Court in Shanghai. His case studies provide useful insights into how extraterroriality worked in practice.