Working down the mine was Tim's worst nightmare, but making friends with Jonnie and Evie made him think that maybe working down the deepest, most dangerous pit in England wouldn't be half as bad as the dream he'd had last night. After all, if his brother and sister had done it for this long, surely it couldn't be that bad? But Jonnie isn't who they think he is, and when the children are forced to flee the mine, their village and families, the dark curse of Skry seems to follow them.