Book excerpt: Alasdair Gray, author of the modern classics Lanark, Poor Things and 1982, Janine, is without doubt Scotland's greatest living novelist. Since trying (unsuccessfully) to buy him a drink in 1998, Rodge Glass, first tutee and then secretary to the author, takes on the role of biographer, charting Gray's life from unpublished and unrecognised son of a box-maker to septuagenarian "little grey deity" (as Will Self has called him). A Jewish Mancunian Boswell to Gray's Johnson, Glass seamlessly weaves a chronological narrative of his subject's life into his own diary of meeting, getting to know and working with the artist, writer and campaigner, to create a vibrant and wonderfully textured portrait of a literary great.