The Law of Blood (1916)

"Al" Spencer, a gambler not averse to cheating, occupying an apartment with his wife and infant daughter, deserts his family after attacking and robbing a card-player a confederate had brought to his place. Living in the same building is Nancy Springer, a shoplifter whose thief husband is in jail awaiting trial. His attorney, anxious to create sympathy for his client, urges Nancy to borrow an infant and appear with it in court during her husband's trial. Mrs. Spencer innocently lends her baby; the ruse works, and Springer is acquitted. Nancy, going to return the baby to its mother, finds the woman dead, so she and her husband informally adopt the child, naming it Nell. Fifteen years elapse. Spencer, former gambler, now known as Albert Sprague, is prosperous in business and apparently reformed. He marries a wealthy widow with a young son. They reside on Long Island on a very pretentious estate. The Springers, attracted by Mrs. Sprague's display of gems and jewelry, plot to rob the Sprague residence. Leasing an adjoining estate, they soon are on friendly terms with their intended victims. Nell, now a clever thief, is purposely seized with illness while visiting at Sprague's and cannot be removed for several days, during which time it is planned that she shall steal the Sprague diamonds, pearls and jewelry. She falls in love with young Sprague, confesses to him that she is a thief. Her adopted parents learning of this, and knowing the police will investigate, boldly rob the Sprague residence. While doing this, Springer kills young Sprague and his mother dies of shock. The adopted daughter Nell is locked up, tried, and found guilty of complicity in the murder. A thief turns state's evidence, the Springers are caught, and through her statements Sprague learns that Nell is his own daughter whom he deserted when she was an infant. He works for her release, finally accomplishes it, then discloses to her his identity, but she spurns him. Eventually they are united.