Separated from his family, Janner must push through the harsh terrain of the Stony Mountains with his friend Maraly to the Ice Prairies. They’ll need to evade deadly Snickbuzzards, wolves and the fearsome Bomnubble. The legendary under-ice city of Kimera beckons as a place of refuge for the Wingfeather family. After being betrayed and handed over to the Fangs, Kalmar finds himself imprisoned in the dungeons of the Phoob Islands. The entire Wingfeather family will be faced with questions of who to trust and an impossible decision over their future when a new evil emerges in the frozen tundra.
With Maraly’s help, Janner embarks on a perilous journey through the Stony Mountains, towards Kimera, where his family waits. Meanwhile, Kalmar struggles after being locked up in the Phoobs and a new leader takes General Khrak’s place.
Aided by an untrustworthy ally, Maraly and Janner face the most perilous part of their journey. Meanwhile, in Kimera, the Wingfeathers finally make it to safety, but Oskar faces challenges with translating the First Book.
Janner arrives in Kimera, wounded, but ready to try unlocking Leeli’s magical songs in order to find Kalmar. Meanwhile in the Phoobs, Artham is given a choice by the Stonekeeper to transform in order to save the children from her clutches.
General Timber declares war on Kimera. The Wingfeathers, put in a compromising position, are thrust into the chaos, fighting for their survival and their freedom now that Gnag’s forces found a way to survive the cold.
While trying to cross the Dark Sea of Darkness, the Wingfeathers face sea dragons who block their path. Secrets from Podo’s past emerge, an old debt must be forgiven, and Artham reunites with the family and reveals a startling truth about Kalmar.
Struggling to fulfill his most challenging task as the Throne Warden yet, Janner and his family try to aid Kalmar. All the way back in Dugtown, the time to fight looms nearer and Sara must prepare.