While recognising that distinctions between categories are often fuzzy, this work covers many types of migrants including explorers, slaves, pilgrims, mineworkers, labourers, exiles, refugees, sex workers, students, tourists, retirees and expatriates. Cohen covers a long span of history and many regions and themes, giving context and colour to one of the most pressing issues of our time. The text is supplemented by a series of vivid maps, evocative photographs and powerful graphics.