• 
  Holly Aird

  Herself - Narrator (voice)
• 
  John McVicar

  Himself - Ex-Convict and Author
• 
  Jeremy Coid

  Himself - Psychiatrist to Ian Brady (as Professor Jeremy Coid)
• 
  Lord Longford

  Himself (archive footage)
• 
  Joe Chapman

  Himself - Former Prison Officer
• 
  Eric Allison

  Himself - Ex-Convict, Pen Pal and Journalist
• 
  Ian Fairley

  Himself - Former Detective Chief Superintendent
• 
  Geoff Knupfer

  Himself - Former Detective Chief Superintendent

• 
  Terry Kilbride

  Himself - Brother of John Kilbride
• 
  Fred Harrison

  Himself - Journalist
• 
  Carol Ann Lee

  Herself - Myra Hindley's Biographer
• 
  Robert Douglas

  Himself - Former Prison Officer
• 
  Roland Gribben

  Himself - Journalist
• 
  Christine Hart

  Herself - Author and Journalist
• 
  Jean Rafferty

  Herself - Pen Pal and Author