Charles King, a sheriff, starts out to capture Black Jack, a bandit. In the fight the bandit's little son is wounded and Black Jack escapes. The boy is adopted by the sheriff, who finds that the lad has a birthmark on the left shoulder. Black Jack is arrested in another county and sentenced to fifteen years. His son grows up and knows only the sheriff as his father. After many years Black Jack returns to get even with the sheriff. Thinking his own boy is the sheriff's son, he captures the lad, but is seen by the sheriff's daughter, who tells her father. In a lonely cabin Black Jack is about to kill the boy, when the birthmark reveals that it is his own son. Black Jack's half-bred pal pulls a gun to kill the lad, but the bandit steps between them and receives the bullet in his own body. The sheriff and daughter arrive as the bandit expires, and the sheriff promises him not to tell his son who his father was.
