An odd belief that the dead can be tormented through their surviving loved ones prompts Dr. Miguel Hernandez to seek revenge against the woman who shunned him through her husband, Matthew Vane, and daughter Mildred. With the help of some old love letters supposedly written by Matthew's deceased wife to another man, the doctor suggests that Mildred is not Matthew's daughter, whereupon the shocked father leaves the young woman with Miguel and departs on a journey. Purportedly testing Mildred to determine her true parentage, the doctor actually imprisons her, allowing her to see no one but the lecherous Ralph Jeffries, whom she loathes. Mildred smuggles a note to her sweetheart, Albert Moreland, who arrives with Matthew to rescue her just as Ralph is attacking her. The doctor's scheme is fully revealed, and Mildred is reunited with her father and sweetheart.