Morgiana (1972)

When their wealthy father dies, his daughters Viktoria and Klára inherit his fortune. The evil Viktoria inherits a small castle and all the possession inside including jewelry but the naive Klára inherits most of his assets. Viktoria plots with the gypsy fortuneteller Otylie to poison her sister with an undetectable liquid to inherit her fortune. Klára feels sick and her doctor cannot diagnosis her, while Viktoria uses the poison in the milk of her dog. Meanwhile, Klára falls in love with Lieutenant Marek. When Otylie blackmails Viktoria, she throws Otylie off the cliffs in the sea. Soon Klára receives a letter telling that she was poisoned and asking for money to give the antidote to her. Who wrote the letter?