It is thought the skin was cut from the corpse of one of Guy Fawkes' fellow conspirators in the Gunpowder Plot of 1605.
And if you hold the novel in the right light, you might even see a ghostly face on the cover, it is claimed.
Called "A True And Perfect Relation Of The Whole Proceedings Against The Late Most Barbarous Traitors, Garnet A Jesuit And His Confederates" it tells of the grisly end met by the Gunpowder Plotters.

He believes that marks on the leather are evidence of torture, and says a Latin inscription on the cover which reads "severe penitence punished the flesh" was written to make sure people knew what had happened to the victim.
