The Velvet Fox by Catherine Fisher
After rescuing Tomas from enchantment, orphan Seren Rhys is enjoying her first summer at Plas-y-Fran. But as autumn arrives, it brings with it a mysterious new governess who seems intent on drawing Tomas away from Seren and his family. Dangerous figures from a bewitched toy carousel stalk the house and, fearing the worst, Seren calls on the clockwork crow to help her. But can he reach her in time, and will Tomas be able to escape the magical creatures threatening to ensnare him, led by the Velvet Fox?