Tig and Jamie go to stay at their Grandad's farm. He warns them not to go into the old mines on the hill. However, Jamie is keen to explore and she persuades Tig to go up to the mines. At the entrance to the mines they find some interesting objects, and realise someone has been into the disused mines recently. That night, Tig sees some car lights heading towards the mines, and he, Jamie and Grandad go to investigate.