Sylvia Mason, a mysterious girl, lives in a cabin by herself and sells her bead work to the visitors at a large hotel nearby. At the hotel, Sylvia meets Easterner Henry Hilliard, who falls in love with her, but she refuses to marry him and will not explain her reasons. Thus Henry returns East without learning that Sylvia's father had been murdered by his private secretary Jack Leslie in revenge for her refusal to marry him. One night after Henry's departure, Leslie, now known as the outlaw "The Shadow", breaks into Sylvia's cabin. There is a struggle that leaves Sylvia unconscious, and when she awakens she finds a note claiming that because Leslie has violated her, she must marry him. Meanwhile Henry's mother, horrified that her son wants to marry this strange girl, informs Sylvia that their marriage would destroy him. Sylvia agrees to give up Henry, but he learns her story from Padre Constantine and goes to search for her. Sylvia has gone to Leslie and Henry follows.