Teenage wizard Gemma Raven makes a terrible bargain with the Nekross – if they save her mother's life, she will cast a spell strong enough to destroy Tom and Benny's friendship forever! And when Ursula is drawn into the evil plan, she discovers that a fate worse that death awaits her, in the shape of the terrifying Neverwas.

Tom and Benny suffer from Gemma Raven's terrible curse – they hate each other, without knowing why. And the curse is spreading – their school friends are drawn into the conflict, and even their parents are at each other's throats. Can friendship overcome the darkest powers of magic?

Tom faces his greatest challenge yet, when a mysterious elevator takes him to Floor 13 – a destination leading far beyond this world. While Benny struggles to understand this ancient trap, the Nekross arrive, ready to feast – only to discover that Floor 13 has terrible plans for them too…