Sian delves into the case of Scottish medium Helen Duncan, who in 1944 became the last person convicted and imprisoned under the Witchcraft Act. She starts in Helen's birthplace Callander a small town on the edge of the Scottish Highlands.
Disturbed by the gravelly male voice on the recording of a seance, Sian seeks out a modern-day medium and attends a seance. Sian meets an authority on the scientific tests Helen underwent, who claims to possess evidence of her fraudulence.
Sian tracks down a modern medium who claims to bring back spirits in physical form and attends a strange seance in a Dutch monastery. Back in the UK while investigating accounts of Helen's seances, Sian discovers MI5 was tracking Helen.
A parcel from Helen's granddaughter in America appears to contain proof of Helen's powers. Was there more to Helen's trial? An old interview with the man who prosecuted her suggests so and reveals what happened after she left prison.
