Based on

Movies like Srigala Item (1941)

Mardjoeki goes missing after his wealth is taken by his brother, Djoekri. His son, Mochtar, is left behind and is treated like a slave by Djoekri. Later, The Black Jackal, a man in a mask, thwarts Djeokri's cruelty. In a chase scene between Djoekri and The Black Jackal, it turns out that Mardjoeki is still alive, and he is the man behind the mask all this time.