A new Emperor has arisen... and the Empire is collapsing into chaos. Having escaped from the Golden City, Elaine, Johan and their friends - including some strange allies with goals of their own - race desperately towards Ida, hiding place of the ancient Witch-King. Behind them, the armies of the new Emperor – a man permanently poised on the verge of madness – give chase, unleashing monsters and spells from the long-buried past on everyone who stands in their way. Ahead of them, the Witch-King waits, biding his time as he prepares for his ascension. As they endure terrible dangers – and figures from the past – Elaine and Johan come to realise that Elaine’s knowledge of magic and the bond between them may be the only thing standing between the Witch-King and godhood. But if they cannot prepare a defence in time, the entire world will die when the Witch-King rises from his tomb... With Full Circle, the fourth and final instalment in the Bookworm series, the story is complete.