As teenagers, Ifemelu and Obinze fall in love in a Nigeria under military dictatorship. The self-assured Ifemelu departs for America, where Obinze hopes to join her, but post-9/11 America will not let him in, and he plunges into a dangerous, undocumented life in London. Fifteen years later, after so long apart and so many changes, will they find the courage to meet again, face to face?