"No Refuge Could Save" is a short story by Isaac Asimov. It is the second of Asimov's Union Club mystery stories, and the first to be anthologised in The Union Club Mysteries. Overall these mysteries are not rated highly, but this is considered to be one of the best in the series. It first appeared in the September 1980 issue of Gallery under the title "To Spot A Spy". Source: Wikipedia (en)