When Michael Holroyd published 'Basil Street Blues', in which one of our finest biographers turned his attentions to his own family, it was the beginning of a story rather than an end. For as the letters from readers started to arrive, the author discovered an extraordinary narrative that his own memoir had only touched upon. 'Mosaic' is Michael's piecing together of these remarkable revelations: some of which are pleasant surprises, others more startling. A love story, a detective story, a book of secrets, this is a beautifully written journey into a forest of family trees.