Courage (1921)

In Scotland, Stephan Blackmoore, a young husband and father struggling with the design of a new invention, visits his former employer, Angus Ferguson, to collect money owed him. Before Stephan's arrival, Angus is killed by his son, Bruce, in an attempted robbery. Stephan is imprisoned for the murder, but his wife, Jean, continues the work of perfecting his invention and remains faithful to him, despite being courted by a man of wealth and position. When she has all but given up, the real killer confesses, resulting in Stephan's release and his reunion with Jean.