On the very night of his wedding, John Klendon is talking to Helen Carter, his fiancée, on the phone, when he is mysteriously shot by a veiled woman. The shot is heard at the other end and the girl goes into hysterics. Henry Hallam, a guest, is an amateur detective and wealthy. He takes up the case, but the only clue is a bit of paper with the scrawl: "It was I," inclining the police to the suicide theory. The next night Hallam finds a man lying in the roadway, whose features remind him of when he was in Spain with the Carters. He remembers a Spanish beauty casting threatening looks at Klendon, and begins to see light. After caring for the seriously wounded man, he leaves him in care of a physician. Helen enters settlement work to forget the whole terrible affair. The unsuspecting girl is lured to an upper room in a tenement by a dark-visaged woman who pretends her baby is sick, and there finds herself confronted by a dead child, a crazy woman and the door locked.