The Tell-Tale Arm (1917)

Ben Hart, a youthful mining expert, arrives in the mining town and promptly seeks out Mabel Whitaker and her mother, who have a map purporting to lead to a gold deposit. They determine to look at the deposit, but are warned by Jim Halliday, a bad man. That night Mabel sees a hand steal through the window and grasp for the map. She plunges a knife through the arm, and it is hastily withdrawn. The next day Ben sees Jim Halliday near the gold mine and sees that he is nursing a wounded arm. Ben overcomes the bandit and has him jailed.