Yvette Fielding and the team of experts visit the House of Detention, a disused prison in the Clerkenwell area of London. The Clerkenwell House of Detention was built underground at the beginning of the 17th century. It's purpose was to serve as a holding prison to house criminals until they were moved to a more permanent place, like Newgate, where they would await execution. The prison burnt down during the Gordon Riots in 1780, it was then demolished and rebuilt in 1845 as a remand centre. Up to ten thousand men and women a year were kept, amongst them were highway men, prostitutes and their children. They lived in the most appalling conditions, locks behind the bars in dark damp cells.