As a boy in Brooklyn, James McBride knew that his mother was different. But when he asked about it, she'd simply say, "I'm light-skinned". Later he wondered if he was different too, and asked his mother if he was black or white. "You're a human being", she snapped. "Educate yourself or you'll be a nobody!" When James asked what the colour of God was, she said, "God is the colour of water". As an adult, McBride finally persuaded his mother to tell the story. Her story was of a rabbi's daughter, born in Poland and raised in the South, who fled Harlem, married a black man, founded a Baptist church, and put 12 children through college. This is James McBride's tribute to his eccentric and determined mother, and an exploration of what family means.