Not much survived after the NDP virus hit.  It took life indiscriminately, from the humblest farmer in rural Africa to John Everyman in suburban America to European monarchy.  Preachers sang their old songs of the End of Days and the Rapture, waiting with bated breath to hear the trumpets sound.  But none came.  The entire planet stood still for a year or two as countries fell apart, societies crumbled and more people died.  Finally, as suddenly as it had arrived, the virus stopped infecting.  And, like ants after a rainstorm, the human race began to rebuild itself in any way that it could.

It has been decades since the Purge ended.  Societies have sprung up anew, scattered throughout the globe, shadows of their former selves.  Some cities have rebuilt themselves in the underground tunnels that used to hold trains and subway cars.  Others have set up shop right where they used to, taking their chances in the open world above.  Generations have been born and raised amid the dingy streets of the New World.  Amenities such as electricity and running water have been restored.  But something still lurks in the darkness.

They call them Remnants.  Nothing more than descendants of those who contracted the virus and survived.  They are looked down upon in society, as a reminder of what may very well have been the end of the world.  Aftereffects of the disease has manifested as extremely consistent pigmentation anomalies, more often than not silver to white hair.  Some regard the Remnants to have the ability to use magic, and fear them.  Others see them as carriers of disease (though medical research has not proven this true) and despise them.  Remnants themselves either embrace who they are as survivors, or hide their identity out of fear of others and hatred of themselves.

Our story takes place in one of the subterranean cities, one of the largest.  Called the Londerground by its inhabitants, it stretches just as far as it did before the virus hit. Most of the minor stations and lines are used for residential areas, while the major stations such as King's Cross, Baker Street and Paddington have been recycled as community centers, shopping centers and offices.  While there is a certain lawlessness amongst the tunnels, the Londerground Peace Officers still strive to keep it to a minimum.  Most things have settled into a natural order, and society has come to a careful equilibrium.