The story is based on Operation Stone, during which State Security agents deliberately misled citizens of the Czechoslovak Republic who were attempting to leave the country illegally by creating fake borders and fake border patrols and interrogation teams from American, German, and French authorities. During interrogations, State Security officers convinced detainees that they had actually crossed the state border of our republic and obtained information from unsuspecting people, which was then used in criminal proceedings.

The reclusive writer Henry returns from his travels and finds a pile of letters on his doorstep. Without a salutation or signature, the poems written on used train tickets remind him of his current literary impotence. Henry opens envelope after envelope and reads, reading between the lines, gradually allowing the foreign words to touch his soul. After a while, his imagination awakens, and he may even start writing again himself. But who are these mysterious letters from?