'Witches, Mam? We've made an alliance with witches?'
'I know you'll find it hard because of what your master's taught you,' Mam said, laying a hand on my shoulder, ' but we can't win without them. It's as simple as that. And we have to win, we really do.'

As the Spook's apprentice, Tom's first duty is to protect the County from the dark. But now Mam needs his help in her homeland of Greece. One of the most dangerous of the Old Gods, the Ordeen, is about to return there, bringing slaughter and devastation.

Mam has summoned a powerful group to her side, but among them are Tom's old enemies, the Pendle witches. Can Tom go against all the Spook has taught him and ally himself with witches? What is secret that Mam is keeping from him? And what sacrifices must be made in the battle against the dark?