Salvage (1921)

When her wealthy husband informs her of the death of her baby, Bernice Ridgeway leaves him and takes a tenement apartment opposite that of Kate Martin, whose husband is in prison, and becomes acquainted with Kate and her child. When Kate commits suicide, Bernice takes the child and assumes the dead woman's name; and the child's father, Fred Martin, having finished his term, discovers the deceit but keeps the secret.