A cosmic fireball crashes into remote woodland, awakening a terrifying creature hidden in the depths. 1976: James Wheeler enters a cave determined to uncover the truth – and is never seen again. All that’s found is a single frame of Super 8 film, capturing the silhouette of a horrifying creature. Now Wheeler’s granddaughter, along with five explorers, set out to investigate the legend of the ‘Bone Keeper’. But deep in the caves, they realise they are being hunted, and the line between hunter and prey blurs. Will they uncover the truth and escape the creature – or become the next missing souls?