Write a concise summary of the following. Be sure to preserve important details: Half of a Yellow Sunby Chimamanda Ngozi AdichieBuy the bookAmazonBlackwell'sBook DepositoryBookshop.orgFoylesWaterstonesWH SmithWorderyThis heartbreaking and beautifully written book lays bare the horrors of the Nigerian Civil War. In the 1960s, Ugwu, a boy from a poor village, goes to work for a university professor.    When the professor's girlfriend, Olanna, moves in, Ugwu becomes close to the couple. But their lives will be upended and changed forever by the conflict to come. Buy the bookAmazonBlackwell'sBook DepositoryBookshop.orgFoylesWaterstonesWH SmithWordery