Eleven year-old Tilly has lived above her grandparents' bookshop ever since her mother disappeared shortly after she was born. Like the rest of her family, Tilly loves nothing more than to escape into the pages of her favourite stories.

One day Tilly realises that classic children's characters are appearing in the shop through the magic of 'book wandering' - crossing over from the page into real life.

With the help of Anne of Green Gables and Alice in Wonderland. Tilly is determined to solve the mystery of what happened to her mother all those years ago, so she bravely steps into the unknown, unsure of what adventure lies ahead and what dangers she may face.