De Stem des Bloeds (The Voice of Blood), also known as Njai Siti, is a 1930 film from the Dutch East Indies (now Indonesia). It was directed by Ph. Carli and starred Annie Krohn, Sylvain Boekebinder, Vally Lank, and Jan Kruyt. The film follows a man and his mistress who reunite after their son and step-daughter unwittingly fall in love. The black-and-white film, which may now be lost, was tinted different colours for certain scenes. It was released in early 1930 to commercial success, although critical opinion was mixed.