This investigation revolves around two people known as the Ladies of Llangollen, two Anglo-Irish ladies who, in the late 1700s, caused scandal and fascination when they set up home together in a house known as Plas Newydd in the hills of Denbighshire. The Most Haunted team visit the house to discover if any of its former occupants are still there.
Barrie John joins the team as they travel to Carmarthenshire in Wales to investigate the spooky Pembrey Woods, which are renown for tales of phantoms. Many ships have been attacked and burnt here, their cargo stolen and their men slaughtered. These "men of the night" would carry lanterns to lure boats to the rocky shore where they would then be attacked. Among the cargo were exotic animal such as dancing bears which would then be lose in the forest. There are also tales of a mysterious ship with tattered sails and an eerie green glow, along with the regular sightings of apparitions walking on water.
Underneath the south eastern suburbs of Greater London are 22 miles of man-made tunnels which were created for the mining of flint and chalk and date as far back as 1250. The mines, now known as the Chislehurst Caves, are a popular tourist attraction for many reasons including its use as an air-raid shelter for 15,000 people during the war and its more recent status as a popular music concert venue. The team, joined by guest medium Brian Shepherd, spend two nights investigating purported ghostly phenomena throughout this 'underground city'.