Young gypsy girl Mary, is seduced by the immoral Robert Crane and abandoned. She is exiled from the gypsies and, along with her mother Zenda, known as "The Woman in Black," she vows revenge. Meanwhile, Crane blackmails Stella Everett's father into forcing her to marry him, even though she loves Frank Mansfield, Crane's rival for a congressional seat. Frank wins, but Stella still faces the prospect of marriage to Crane until Zenda comes to her with a plan. On their wedding day, after the vows are recited, when Crane lifts the veil from his wife's face, he is shocked to discover, that his new bride is Mary. Now Stella and Frank are free to marry, and Zenda has gained her revenge.—Pamela Short

To save her father from suicide and disgrace, Stella Everett consents to marry Robert Crane, a wealthy politician, and breaks her engagement with Frank Mansfield, Crane's rival for congressional honors. Crane has ruined a young gypsy girl named Mary, and her mother, Zenda, known as the Woman in Black, seeks him to avenge the wrong. Chancing to see a campaign poster bearing Crane's picture, she plunges a dagger into it as Mansfield passes by. Puzzled by her action, he learns her story, and brings the two gypsies to Stella, who is to marry Crane next day. Everett, hearing the facts, is about to call the marriage off, but the Woman in Black proposes a scheme. The marriage takes place as arranged, and Crane, lifting his bride's veil, uncovers the face of Mary, the girl he wronged. Zenda buries the dagger in his heart. Mansfield is elected to the office and marries Stella.—Moving Picture World synopsis