'This time, the author is ingeniously concerned with the dangerous topic of fifth-columnism. Dangerous, that is, for those who indulge in it. We are not going to give an instance, for that is for you to guess at. At any rate, certain it is that information about convoys is getting to the enemy. But how? 'It's absurd,' ruminates Bartlett. 'The censorship is nearly as foolproof as it can be made. There is, of course, the possibility of a code. An innocent letter dealing with the family doings might conceivably cover the most vital news.' 'You're letting your imagination run away with you,' snaps Sir Wilfred. 'Codes and ciphers survive mostly in the pages of Secret Service fiction and in radio plays.' Which is right?'
Source:
'Listening Post', Barrier Daily Truth, 14 May 1941, p.5.
