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The Grain of Dust was based on the best-selling novel by David Graham Phillips. Lillian Walker plays Dorothy Hallowell, known as "the grain of dust" because of her questionable parentage and her tendency to drift in and out of trouble. Unfairly branded a "scarlet woman," the innocent Dorothy finally decides to live up to her billing and attempts to steal small-town lawyer Frederick Norman (Ramsey Wallace) away from his wife Ursula (Corinne Urzell) -- hardly a difficult task, since Frederick is hardly a paragon of virtue. But Dorothy is essentially a good girl, and her virtue is ultimately rewarded. The Grain of Dust was remade in 1928, with Alma Bennett playing the title character as a villainous predator.