http://www.tthfanfic.org/Story-1927/houses+Impurity.htmFred unearths a puzzle in her paperwork, and sets out to solve the mystery. Spoilers for AtS5:1, Underworld. Prequel to Lab Coats (complete).enThu, 02 Oct 2003 07:00:00 GMTThu, 02 Oct 2003 07:00:00 GMThttp://www.tthfanfic.org/rssinfo.php1440http://www.tthfanfic.org/Story-1927/houses+Impurity.htmChapter "Impurity" has been added to the story "Impurity" by houses.Thu, 02 Oct 2003 03:00:00 -0400houseshttp://www.tthfanfic.org/Story-1927/houses+Impurity.htm