Some things start before other things.
Tiffany Aching lives up on The Chalk of Discworld, in a rural shepherding community. She was the youngest of her family, until the baby brother was born, now she spends much of her time minding him. She is looking after him when something decidedly odd occurs, a strange monster leers out of the stream. Puzzled, she uses her brother as bait, before smacking Jenny Green-teeth back to wherever it was she came from. Not that she intended her brother to be harmed, but she did her research and knew what has to be done. But this is merely the beginning, and soon Tiffany is mixed up in a whole heap of more trouble as she sets off to rescue her brother from the clutches of the Queen of Fairyland.