Three of these are among my favorite spy writers Oppenheim's Great Impersonation, in which the famous plot twist turns on who is impersonating who, Buchan's Greenmantle, which I have reviewed elsewhere, and one of Manning Coles' Tommy Hambledon stories, No Entry, set in East Germany. This is not my absolutely favorite Hambledon, but it is as always very good. Hambledon is looking for a young Englishman who vanished from a pleasant German inn about ten miles from what was then the Zonal Frontier i/e. the East German border. half of Manning Coles was a man who had himself been a spy in Germany during World War 1, and I have always felt his German backgrounds were the best. The other two stories, by Martha Albrand and Eric Ambler, are by respected writers, but I have not read them. The only Abler I have tried was too grim for my taste. ( )