In a British colony in West Africa, Henry Scobie is a pious and righteous man of modest means enlisted with securing borders. But when he’s passed over for a promotion as commissioner of police, the humiliation hits hardest for his wife, Louise. Already oppressed by the appalling climate, frustrated in a loveless marriage, and belittled by the wives of more privileged officers, Louise wants out.

Feeling responsible for her unhappiness, Henry decides against his better judgment to accept a loan from a black marketeer to secure Louise’s passage. It’s just a single indiscretion, yet for Henry it precipitates a rapid fall from grace as one moral compromise after another leads him into a web of blackmail, adultery, and murder. And for a devout man like Henry, there may be nothing left but damnation.