The Forgotten Law (1922)

Margaret Jarnette discovers that her husband Victor has been cheating on her and confronts him. Outraged, Victor has his lawyer rewrite his will so that in the event of his death, his brother Richard, and not his wife, will get custody of his daughter Muriel. Whenn Victor dies shortly afterward, Richard suspects that Margaret murdered him. He takes custody of Muriel, but soon suspects that things might not be so cut-and-dried.