Freda, alias "Society Shirley," abandons her life of crime and becomes engaged to Jack McCarthy, a young detective. "Conny Peters," a gilt- edged confidence man, persuades Freda to go back to the old practice. McCarthy loses sight of her. Later, he becomes betrothed to Grace Manley. A year later McCarthy is detailed to trail "Conny Peters" and his accomplice. He captures the man first, and then discovers that the woman is Freda whom he once had asked to marry him. He offers her her freedom. She misunderstands this to mean that the detective still loves her. In Freda's room McCarthy is set upon by pals of "Conny Peters." The girl crook battles with them to save his life. A passing policeman notifies the detective bureau of McCarthy's danger and officers are sent to his rescue. Grace Manley comes with them. The crooks overpowered, Grace rushes to her lover. Freda, realizing that her place has been filled by another, goes silently away.
—Moving Picture World synopsis