The Velvet Fox — Catherine Fisher

After rescuing Tomos 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 Tomos 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 Tomos be able to escape the magical creatures threatening to ensnare him, led by the Velvet Fox?