Chimamanda Ngozi Adichie—if those three words sound alien, it is a sign that, somehow, you have missed the excellent neighbouring novels, “Purple Hibiscus,” and “Half of a Yellow Sun.” All right, I admit—the neighbouring part is stretching it a little bit. Although Nigeria has quite a long shoreline, it is not the Baltic Sea. Then again, “Americanah” takes place in a large part in, what a lucky coincidence, America. It is almost our closest neighbour, only across an ocean, and not even the biggest one. And, anyway, the world is a village. That is why a Nigerian woman graduated with a diploma in creative writing in the United States, and proved that it was certainly not thanks to racial parity. She just has the talent.