The Cloud Horse Chronicles duology concludes with time running out for Tiggy to find the trio of Guardians who can save Thrynne from eternal winter. Tiggy Thistle and the Lost Guardians is the second and final title in the duology by Chris Riddell. This jacketed hardback features two-colour illustrations throughout.

The Guardians of Magic disappeared ten years ago, leaving the Kingdom of Thrynne in the icy grip of a powerful sorceress. Most people have fled in search of warmer lands, escaping the Ice Monsters that roam the streets. Meanwhile, young Tiggy Thistle lives hidden and safe with a kindly Badger until the day she meets one of the crafty Stiltskin brothers and she has to run from her home. So begins Tiggy's quest to find Zam, Phoebe and Bathsheba—the lost Guardians and their Cloud Horses—the only people, she believes, who can save Thrynne from the curse of endless winter.