In What I Know I Cannot Say / All That Lies Beneath, Dai Smith combines a novella and a linked section of short stories to create a dazzling fictional synthesis that takes the reader on a tour of the South Wales Valleys during the twentieth century. All That Lies Beneath is white-knuckle fiction ride: power, sex, money, and ambition all twist through the pages as Smith creates a feast of intellectual and physical provocation in stories that send a shudder of fearful recognition directly through to the reader.