Incognita. This is the name of the last movie, the third of a trilogy, directed by Mikhail Pandoursky. Anna Netrebko and Valery Gergiev will play the roles of the mother, an opera singer, and the father of Anton Horn, a composer and director of an opera house who is working on a great musical work about the myth of Prometheus. Pandoursky has just one days time to work with Anna Netrebko. It will be this summer at the Mariinsky Theater in St. Petersburg. And he knows exactly what he wants from her: a song without words, a pure vocalise recording.