A young girl's disobedience leads her and her sister into a perilous magical kingdom. Imogen, tasked with being nice to her family, instead follows a mysterious silver moth through a hidden door in a tree, with her younger sister Marie in tow. They tumble into a fantastical realm where they must race against time, aided by an unlikely group of companions including a spoiled prince, a dancing bear, and a grumpy hunter, to navigate the dangers and find their way home.

This book has been recognized as a significant debut, earning a shortlist for the Waterstones Children’s Book Prize. Reviewers and readers have highlighted its magical elements and engaging narrative, often praising the illustrations by Chris Riddell. The story is described as thrilling and sharply funny, with characters that resonate with young readers. It is noted as the beginning of a promising series, setting the stage for further adventures.