They become suspicious of a former priest who lost his son in the mine , but find out that he is innocent .
He deduces that the Coblynau , the normally benign spirits of deceased workers , are forced by a person to kill others .
others become suspicious of a former priest who lost his son in the mine , but find out that he is innocent .
He deduces that the Coblynau , the normally benign spirits of deceased workers , are forced by a person to kill others .