Discworld (Young adult)

A young witch-to-be named Tiffany teams up with the Wee Free Men, a clan of six-inch-high blue men, to rescue her baby brother and ward off a sinister invasion from Fairyland.

At 9, Tiffany Aching defeated the cruel Queen of Fairyland. At 11, she banished an ancient body-stealing evil. At 13, Tiffany faces a new challenge: a boy. And boys can be a bit of a problem when you're thirteen . . . . But the Wintersmith isn't exactly a boy. He is Winter itself--snow, gales, icicles--all of it. When he has a crush on Tiffany, he may make her roses of ice, but his nature is blizzards and avalanches. And he wants Tiffany to stay in...

Tiffany Aching calls upon her fellow witches as the fairy horde prepares a fateful invasion and an old enemy prepares to launch an assault that could destroy the world as Tiffany knows it in this final installment of the Discworld series. Tiffany Aching adventures series, 288pp.