The Soviet Union, writer and journalist Yevgenia Petrova unusual hobby includes collecting the envelopes from his own letters, sending them to different countries, All except the states. he invents: city, street, name of the addressee. Therefore, the envelopes comes back, but decorated with foreign stamps and postmarks "Destination is not valid." Once the envelope that was sent to New Zealand, mysteriously finds its target. Petrov gets a mystical response from a distant land. And then he falls under the scope of the KGB, who regard him as a foreign spy.