Yuma, a deaf and dumb Mexican, teaches Dan Morgan, a cowpuncher, the sign language. That night, Morgan wins several hundred dollars in a game. Hugh Haines follows Morgan to his home to secure the money. Yuma watches Haines. Haines enters Morgan's shack and hides behind the curtain. Morgan discovers the shadowgraph message on the window shade, which tells him that a man is hiding in the room. Morgan captures him, and takes him to the sheriff. Yuma is rewarded by Dan's gratitude.
