After five hundred years of drowning the Overworld, the Cloud Curse is changing. In their arrogance and complacency many dragons thought they were safe, but no longer. The Curse has shifted course and is attacking each dragon Clan in different and insidious ways. Elder Khennik kin Blazeborn is determined to stop it, but in the vast libraries of Spire Heights it's hard to know where to begin – or who to trust.

Spire Heights offers the Rift Riders a different threat: boredom. With no trade treaties to negotiate and few feasts to attend, the ambassador doesn't really need them, leaving the humans with far too much time on their hands. Still, Lieutenant Nera is confident that for once she can keep out of trouble, because surely nothing dangerous ever happens in a library...

Return to the Dragonlands as curses, conspiracies, friends and foes combine in the Riders' most mysterious adventure yet.