The Overwhelming by J. T. Rogers
Seizing the opportunity to research a book, Jack Exley uproots his family from Illinois to Rwanda in early 1994. Alarmingly out of depth, Jack begins a fervent search for his dear and missing friend while his wife and teenage son find trouble of their own. As Jack involves himself in the local politics, he discovers a pattern of brutality and beliefs that jeopardizes the lives of everyone around him. This is a gripping story of a country on the brink of genocide.