Giovanni Pallazzi, a former member of the Black Hand, an Italian criminal organization, comes to America with his blind daughter Lucia and prospers. Hearing of his success, his former associates demand that he aid in their support. Giovanni refuses, and the organization decrees that he shall die. Luigi, the leader, comes to America and tries to force Lucia to marry him, but she refuses. While praying one night, her father is killed. Though blind, her hearing is acute and she notices a peculiar cadence in the walk of her father's slayer. Luigi now takes charge and forces her into the street to play her violin for gratuities. After she is picked up by the prosecuting attorney, her eyesight is restored by physicians. When the police apprehend Luigi, Lucia puts on a blindfold and is able to identify him as her father's killer by the sound of his step.