A bundle of yellowed sheets, accidentally bought at a flea market... The amazing correspondence that the great Eastern atheist poet conducted with the intellectual abbess of a small German monastery... Is it hard to imagine? Yes. But it is even more difficult to realize that, according to all historical facts, the poet and the abbess are separated by a century! Experts in medieval secret writing are immersed in mysterious texts - and gradually begin to understand that they are faced with one of the most amazing secrets of the past. They also understand something else: they are being relentlessly followed by people who will stop at nothing to take possession of these letters...