The shadow moth

Imogen should be nice to her little sister Marie. She should be nice to her mum's boyfriend too. And she certainly shouldn't follow a strange silver moth through a door in a tree. But then ... who does what they're told? Followed by Marie, Imogen finds herself falling into a magical kingdom where the two sisters are swept up in a thrilling race against time--helped by the spoiled prince of the kingdom, a dancing bear, a very grumpy hunter ... and...