Richard Bor brings his neighbor, the landowner Drazicky, an old book. The latter tries in vain to persuade his wife Dagmar to leave. In the book Drazicky finds the story of the Mystery of the Black Tower and he falls asleep. He goes into the tower and finds an alchemist's laboratory and the body of a man holding instructions describing how he can be revived. Drazicky successfully carries out the experiment and finds out that the man is his ancestor Jesek Drazicky who lived during the time of Rudolf II. He had become the apprentice of the alchemist Borro who had entrusted him with the mystery of the elixir of life.