Soren and the rest of the band of owls in the great tree must fly to the mysterious Northern Kingdoms in order to prepare for the deadly attack against them, but St. Aggie has fallen to the Pure Ones and without Soren and his allies, their enemies will prevail.

"Enraged by his clash with Soren and driven by and all-consuming desire for power, Kludd and his group, the Pure Ones, launch an attack upon the Great Ga'Hoole Tree. The noble owls who live there must fight fiercely to protect their resources and defend their honor."--P. 4 cover.

Soren, Gylfie, Twilight, and Digger, four owls, band together to seek the truth and protect the owl world from unimaginable danger.

"Even though Soren was kidnapped and taken to the St. Aegolius School for Orphaned Owls, he has longed to see his sister, Eglantine, again. Now Eglantine is back in Soren's life, but she's been through an ordeal too terrible for words. And Ezylryb, Soren's mentor, has disappeared ... In order to rescue him, Soren must embark upon a perilous quest." --P. [4] of cover.

While Coryn and his companions journey to a wintery realm where mysterious owls live, the king becomes the target of an assassination plot and it is up to Primrose and Eglantine to save him.