'When your grandpa was in hospital, he asked me one night to promise him that, when he had gone from us, I would teach you Islam - our Islam: the Islam I grew up with ... In that dark, impersonal room, he was thinking of you.' This is why one father began to teach his daughter night after night not only about his own religion, but about that which unites all believers, about God and death, about love and the infinity that surrounds us. This...