Her Own TARDIS: Day Is Long

When someone from the Doctor's past arrives to 13 Bannerman Road, not only does her mere presence throw a wrench into the livelihood made by the Smith and Langer families, but it may draw someone away as well. Just why is she here anyway? "How could he hide something like this from me? I waited for him and this is what I get as a thanks?" (Sequel to "Her Own TARDIS")