The Strange Boarder(1920)

Honest Arizona rancher Sam Gardner, goes with his motherless son Billy to the city, where he is cheated out of ten thousand dollars by a band of crooks. Taking up residence in a boardinghouse where he meets Jane Ingraham, Sam decides that the only way to regain his losses is by gambling. To achieve this, he makes friends with gambler Kittie Hinch who takes him to Jack Bloom's gambling house. When Bloom begins flirting with Hinch's wife Florry, the injured husband kills his rival and the evidence points to Sam as the killer. Jane tries to provide him with an alibi, but fails. Just as things look grim for the rancher, a wire arrives from Hinch, now in Mexico, confessing to the crime. His faith in mankind thus rewarded, Sam is free to marry Jane