In this pioneer study, Ion investigates the experience of the Canadians who were part of the Protestant missionary movement in the Japanese Empire. He sheds new light on the dramatic challenges faced by foreign missionaries and Japanese Christians alike in what was the watershed period in the religious history of twentieth-century East Asia. The Cross in the Dark Valley delivers significant lessons for Christian and missionary movements in Asia, Africa, the Americas and Europe which even now have to contend with oppression from authoritarian regimes and with hostility. This new book by A. Hamish Ion, written with objectivity and scholarly competence, will be of interest to all scholars of Japanese-Canadian relations and missionary studies as well as to general historians.