Sian's mission to get to the truth behind Helen Duncan's apparently supernatural abilities draws to a close - but a secret package sent from Helen's granddaughter in America leaves Sian with what appears to be the smoking gun she has been waiting for. The package contains what seems to be unexplainable proof that a "spirit" revealed the sinking of a second warship during one of Helen's séances. But this time, the séance happened before even the government was aware. Sian tussles with the few explanations still on the table - was this information received from beyond the grave? Or could Helen Duncan have been a spy and in league with the enemy? Wherever the truth lies, Sian feels increasingly sure there was more to Helen's Old Bailey trial and conviction than a case of fraud. The discovery of an old interview recording with the chief constable of Portsmouth Police, who prosecuted Helen, confirms Sian's suspicions - the authorities wanted Helen out of the way because she was seen as a danger. There is one final twist to the tale - even after Helen's release from prison, she returned to working as a medium. And the police didn't leave her alone, leading to a raid of her home years later with devastating consequences. Finally, Sian returns to the place where it all started, Callander. She meets three of Helen's granddaughters to discuss all she has learned, but she cannot be certain what will unfold when they gather.