The Fishermen by Chigozie Obioma:
Abulu and his brother grew up without their father. When they were kids, their father went on a Christian pilgrimage to Israel and never returned. Most people believed he was killed by a bomb in Jerusalem, while one of his friends who’d gone on the same pilgrimage said he had made his way to Austria with an Austrian woman and settled there. So Abulu and Abana lived with their mother and their elder sister who, by the time she was fifteen, took up whoring and moved to Lagos to practise her trade.