Follow the team to Paris, France as they investigate the ancient tunnels that run underneath the town. The tunnels, which are also known as "les Carrieres de Paris", were once used for mining and are now believed to contain human remains. Then, the Ghost Hunters head to Haux, France, where they investigate the Chateau Lagorce, a home that has a horrific history and was used by the Nazis in World War II. The current residents of the estate have reported paranormal encounters in each of the 15 bedrooms.