When a wealthy man is found murdered in his bedroom, one of his two adopted sons is arrested and charged with the killing. However, the verdict at his trial is an acquittal. Since the police don't seem to be particularly interested in finding the real killer, the dead man's daughter-in-law--the wife of the adopted son who wasn't charged--takes it upon herself to solve the crime.
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The Acquittal (1923) is a mystery movie. Starring Claire Windsor, Norman Kerry, Richard Travers. Rated 9.0/10 on TMDB. Watch it online free on ZapFlix.