Dynamite Allen (1921)

Betty Reed, a young blind child, is the only witness when mine owner Roger Pitney is murdered, but mistakenly identifies Sid Allen, her benefactor, as the killer. Some years later her sight is restored, and she goes back to the mining town where the murder occurred. The head of the gang that actually killed Pitney tries to kidnap her to silence her once and for all, but she is saved by Sid Allen's son. Betty and the son set out to find and expose the real killers.