A bored girl goes exploring in her new home and finds a locked and papered-over door leading to a bricked-up opening. But that night she discovers that it's actually a portal to a parallel universe, where her "other" family and friends seem much more fun and interested in her than their original counterparts. Until things take a sinister turn, that is.
Moral: Home renovations don't always have to be about doing away with later changes and taking a house back to its original version. Houses are meant to evolve, and sometimes sticking with a second or third owner's revisions make the most sense.