'Unapologetic' is Francis Spufford's brief, witty, personal, sharp-tongued defence of Christian belief, taking on Richard Dawkins' 'The God Delusion' and Christopher Hitchens' 'God is Not Great'. It's a much more polemical book than the author has written before - his previous books include 'I May Be Some Time: Ice and the Imagination' and the genre-defying 'Red Plenty' - and you can listen to extract from it here.