Answer:
The house, a very large mansion the pair inherited from their grandparents, is a large building divided in two living segments. At the entrance one enters a vestibule leading to the atrium, which consists of a living room, two bedrooms on either sides and, separated by a corridor, the kitchen and a bathroom. The second half of the house, entered through a massive oak door, contains the brother’s library, three other bedrooms and a dining room. Due to the disproportions between the surface of the residence and the daily needs of the two inhabitants, the second segment is entered only for cleaning purposes or for the occasional retrieving of a book from the library.
The monotony of domestic life ends abruptly when the brother hears distinct -yet dissimilar- sounds coming from the second section of the large house. Promptly closing the door, in order to keep whatever is there from coming through, the brother tells his sister that “They’ve taken over the back part.” Although saddened by the loss of part of their belongings, the circustamce appears to the two rather unremarkable, (“happened so simply and without fuss”), like being something they were already waiting, from entities they knew would have come.
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Explanation: