In 1929, Lord Barset's expedition to the Antarctic is lost without trace. Or so it seems… Nearly a century later, his grandson funds a much-publicized return to the icy wastes. His mission: to discover what happened to the original expedition. But what he finds instead is an enigma – a battered London police box frozen in ice millennia old. But something else lies in wait in this awful place, something from an era before humankind set foot on the continent's cold soil. A menace frozen in time. Until now.