The Shadow World (Eidolon Chronicles)

The Dodman has begun his reign of terror in Eidolon. Amassing an army of trolls and giants, ghost-dogs and goblins, he is determined to lay waste to the magical Secret Country - and destroy its Queen forever. Now Isadora must return to her world, leaving her family behind, and lead her people against the evil Dodman. Horrified at being left behind, Ellie follows her mother to Eidolon - and walks straight into danger. Captured and held hostage by the Dodman, only Ben and Iggy can save her and protect the Secret Country from becoming enslaved once more...