As the air gets chillier and the days get shorter, D.C. residents’ thoughts turn to Halloween and tales of the weird and the macabre – like hearings on congressional page scandals and polls predicting midterm election outcomes. OK, so Washington, D.C., is not the first city to come to mind when you think of horror and suspense. It doesn’t even compare to New Orleans’ Gothic backdrops or London’s fog-filled streets and alleyways. But on the…