Where is the idiom in this paragraph?

Juan knew there wouldn't be any problem with the text, that the text is irreproachable, innocuous. But the rest? He knows that they probe the letters, sniff them, feel them, read between the lines and the insignificant punctuation, even the accidental stains. He knows that the letters pass from hand to hand through the vast censorship bureaus and that few finally pass the tests and are able to continue their journey. Usually it's a question of months, years if complications arise, a long time in which the freedom and perhaps even the life of the sender and receiver are in suspense. And that's what has our Juan so deeply depressed: the idea that something could happen to Mariana, in Paris, through his fault. Mariana, of all people, who must feel so safe, so at ease there where she always dreamed of living. But he knows that the Secret Commandos of Censorship operate the world over and are granted a large discount on airline fares; therefore there's nothing to prevent them from going even to the darkest Paris quartier, kidnap Mariana and go home convinced of the nobility of their earthly mission.