Background
Source: Wikipedia
Thomas Peckett (or Preskett) Prest (probable dates 1810–1859) was a British hack author. He was a prolific producer of penny dreadfuls and was known as a skilled author in the horror genre. He is now remembered as the co-creator (with James Malcolm Rymer) of the fictional Sweeney Todd, the 'demon barber' immortalized in his The String of Pearls, as well as the co-author with Rymer of Varney the Vampire. He wrote under pseudonyms including Bos, a takeoff of Charles Dickens' own pen name, Boz.
