"You're mine, Blue John! This is your home. But you must never, never go into the light. If you step outside, you will be turned to stone".

Deep in the caverns beneath the mountain, Mam Tor, lives the Queen of Darkness, with her beloved son, Blue John. Made by the Queen from the purple-blue heart of the glacier and the gold of the sun, Blue John is happy living in the caverns, until one day, some children come…..

This is a mythical and moving story by Berlie Doherty, twice winner of the Carnegie Medal.