In the late 1930s and early 1940s, European Jews traveled east to seek refuge in the West. Three thousand refugees transited Japan and China, and more than 21,000 spent the war in Japanese-occupied Shanghai. Japanese diplomats in Europe were caught off guard by the flood of visa applicants, and the Foreign Ministry belatedly confronted a refugee problem. Unexpected visitors became uninvited guests. Vice Consul Sugihara Chiune might have faded into...