Rosavalda Durst

10 years old
A soft whimpering draws your eye toward a pair of children standing in the middle of an otherwise lifeless street.
The children are ten-year-old Rosavalda ("Rose") and her seven-year-old brother, Thornboldt ("Thorn"). Thorn is weeping and clutching a stuffed doll. Rose is trying to hush the boy.
After shushing the boy, the girl turns to you and says, "There's a monster in our house!" She then points to a tall brick row house that has seen better days. Its windows are dark. It has a gated portico on the ground floor, and the rusty gate is slightly ajar. The houses on either side are abandoned, their windows and doors boarded up.
Characters who question the children learn the following information:
The children don't know what the "monster" looks like, but they've heard its terrible howls.
  Their parents (Gustav and Elisabeth Durst) keep the monster trapped in the basement.
There's a baby (Walter) in the third-floor nursery. (Untrue, but the children believe it.)

Rose and Thorn say that they won't go back in the house until they know the monster is gone. They can be convinced to wait in the portico (area IA) while the characters search the house. Although they appear to be flesh-and-blood children, Rose and Thorn are actually illusions created by the house to lure the characters inside. The children don't know that they're illusions but vanish if attacked or forced into the house.