Tony Robinson and science journalist Becky McCall step into the unknown to investigate whether past paranormal events should be taken seriously or dumped into history's litterbin in this new three-part series. From the archaeological secrets of Glastonbury Abbey to the Bath housewives who claimed to be possessed by the spirits of a 13th Century religious sect, Robinson and McCall try to get to the bottom of classic mysteries with the help of historians, scientists and archaeologists. And, throughout the series, Tony tries out some psychic experiences himself including past-life regression, psychometry, séances and automatic writing.

In the 1960s, a group of unconnected people recounted their dreams to a local Bath psychiatrist. These dreams suggested that they were experiencing flashbacks to former lives as members of a 13th century religious sect from France. Could a group of ordinary West Country people really have been possessed by the victims of the Inquisition in a medieval genocide?