Brothel madam turned spy, India Black, is feeling restless until she is invited to meet with Prime Minister Disraeli who has a secret mission for her. Revolt has spread across Europe and reached the shores of England, anarchists have been assassinating the upper classes, one by one. India has been asked to infiltrate the ranks of the underground group responsible for these attacks, the sinister Dark Legion. To stop their dread plot, India will go from the murkiest slums of London to the highest levels of society, uncovering secrets that may threaten her life.