You are holding in your hands the last novel by the great Terry Pratchett, completing the Discworld series. This is the story of a young witch, Tiffany Bolen, who suddenly finds herself the one who must protect the borders of her world from insidious and evil guests from the outside. And this despite the fact that she has more than enough ordinary witch duties and worries... The story is that any person can determine his own destiny and that it retains value at all times, allowing people to remain people.