This story has had me hooked since yesterday, when I read the first installation in The Post. Creepy! I used to hang out a lot in Dupont Circle in late high school/early college. Even got a tat and a couple piercings done not too far from where the townhouse is located...
SEMI-SPOILER ALERT: I can't believe that, despite knowing that someone was MURDERED in that house, it still sold for more than a mil.

This whole situation reminds me of American Psycho (the movie that convinced me that everyone, especially preppily-dressed folks, is probably a serial killer).