S3·E1 Agatha Raisin & the Haunted House

Agatha opens her own detective agency, but potential clients aren't exactly breaking down the door of her new office. In search of new business, Agatha and James visit Ivy Hall, a house said to be haunted since the English Civil War. Are the strange sounds and unexplained footsteps heard at night truly supernatural, or is someone trying to scare the obnoxious owner out of her home?