I discovered Malla Nunn's book A Beautiful Place to Die the old-fashioned way, on the library shelf. She was born in Swaziland, and even though she grew up and still lives in Australia, her memories of Africa have informed all of her books. Imagine, if you can, detective Philip Marlowe transplanted to South Africa in the early 1950s, with a racially-tormented conscience in a racially rigid society where cultural mixing is dangerous. Apartheid noir.
There are four books in the series, and I recommend all of them.