As teenagers in a Lagos secondary school, Ifemelu and Obinze fall in love. Their Nigeria is under military dictatorship, and people are leaving the country if they can. Ifemelu departs for America to study. She suffers defeats and achieves triumphs, all the while feeling the weight of something she never thought of back home: race. Obinze had hoped to join her, but post-9/11 America will not let him in, and he plunges into undocumented life in Britain.
Years later, Obinze is wealthy in a newly democratic Nigeria, while Ifemelu has achieved success as a writer of an eye-opening blog about race in America. When Ifemelu decides to return home, she and Obinze will face the hardest decision of their lives.