narrate the experience of the otis family at the time of entering the avenue of the canterville chess?

As the Otis family entered the avenue of Canterville Chase, the sky became suddenly overcast with clouds, a curious stillness seemed to hold the atmosphere and a great flight of rooks passed silently over their heads. Big drops of rain began to fall before they reached the house. Mrs Umney, the housekeeper, was standing on the steps to receive them. She was an old woman, neatly dressed in black silk with a white cap and apron.