The Masked Woman — Johnston McCulley

The masked woman called herself Madame Madcap, and she gathered a gang of cutthroats determined to loot high society of all its riches . . . starting with the notorious womanizer Hamilton Brone. She worked her criminal magic . . . and grew rich as millionaires swooned at her feet. Members of her gang worshipped her. She could do no wrong. And yet a curious pattern began to emerge, and a strange vengeance took shape -- not just against the men of high society, but against the men of her own brave band of criminals!
A thrilling crime novel from the classic pulp writer who created Zorro!