This is an unusual book for Eric Ambler: his usual plot is a naive, ordinary American or British everyman/anti-hero getting in trouble with greasy foreigners. This time, the naive everyman/anti-hero getting in trouble IS the greasy foreigner--Arthur Simpson, the bumbling, cowardly, delightfully immoral protagonist of Ambler's earlier book THE LIGHT OF DAY. In that book, he faced terrifying dangers: the risk of a very long prison sentence in a Turkish prison, and, the risk of being murdered by angry criminal conspirators. Here, in DIRTY STORY, he faces an almost equally terrifying danger: the possibility of becoming completely stateless, being unwelcome in every country on Earth, unable to work, or live, anywhere. The tension is summarized in one short paragraph: "My passport was received with a mocking smile....We were warned against attempting to find work, unless it was on a ship leaving Djibouti.... We were told, finally, that if either of us was still in the territory seven days hence, he had better be able to swim."
This book is particularly topical today because the strategic technological importance of rare earth metals--scandium, yttrium, and the fifteen lanthanide elements--is a key plot element. Today the world is vulnerable to China's near-monopoly on these elements; if they cut off your country's access to them, then your country's electronics industry, and much of its chemical industry, will grind to a halt.