Yvette Fielding and a team of experts have been called to the Welsh valleys to spend 24 hours in a very active place. A castle that is supposedly one of the most paranormally active places in Great Britain. It's plagued by strange noise, disease and a curse and with so many different kinds of ghost sightings. In 1842 the story of Craig-y-Nos begins, originally it started life as gothic mansion. It was owned by two sets of families over the years, before a famous opera singer took over. In 1878 the supreme diva, Adelina Patti, bought the property and named it Craig-y-Nos, which means "rock of the night" and began making it her home.