The Bolted Door (1923)

In order to inherit her uncle's fortune Natalie Judson enters a marriage of convenience, so she can inherit her uncle's fortune, to mechanic Brooke Garriott, who has long loved her. Natalie pursues her party life while Brooke plunges himself into his work and successfully perfects an engine. One evening Brooke comes home to find Rene Deland making love to Natalie and shows them a telegram saying that the Judson fortune has been wiped out. Deland is no longer interested in Natalie, who now realizes Brooke's true worth and her love for him.