Imogen hates her mum's new boyfriend, and wants only to escape into the plays she acts out with her annoying younger sister, Marie. But when a silver moth lands on her windowsill everything changes.

Following the moth through a door in a tree, Imogen finds herself in a magical kingdom...with her annoying younger sister right behind her. But here there are monsters that come out after dark, and Imogen and Marie must move quickly if they want to survive.

Soon they 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 even the stars above them.

A staggeringly brilliant middle-grade debut - with all the magic of Narnia and the humour of Mary Poppins - A Clock of Stars was the subject of a major pre-empt and will be a landmark launch for HarperCollins.