Nine-year-old Tiffany Aching thinks her Granny Aching might have been a witch, but now Granny Aching is dead & it's up to Tiffany to work it all out when strange things begin happening: a fairy-tale monster in the stream, a headless horseman &, the tiny blue men in kilts, the Wee Free Men, who have come looking for the new 'hag'.