1891. London is simmering in the oppressive summer heat, the air thick with sexual repression. But a wave of morality is about to rock the capital as the puritans of the London Vigilance Committee seek out perversion and aberrant behaviour in all its forms.

Charles Webster, an impoverished photographer working at the Lyceum Theatre, has been sucked into a shadowy demi-monde which exists beneath the surface of civilized society. It is a world of pornographers and prostitutes, orchestrated by master manipulator Marlow, for whom Webster illicitly provides theatrical costumes for pornographic shoots.

But knowledge of this enterprise has somehow reached the Lyceum's upright theatre manager, Bram Stoker, who suspects Webster's involvement. As the net tightens around Marlow and his cohorts and public outrage sweeps the city, a member of the aristocracy is accused of killing a child prostitute...