Lying in a magic-induced coma, the King of Thyrsland is on the brink of death: if his enemies knew, chaos would reign. In fear for his life and his kingdom, his five daughters set out on a perilous journey to try to save him, their only hope an aunt they have yet to meet, a shadowy practitioner of undermagic who lives on the wild northern borders.

No-one can stand before the fierce tattooed soldier and eldest daughter Bluebell, an army commander who is rumoured to be unkillable, but her sisters, the loyal and mystical Ash, beautiful but unhappily married Rose, pious Willow and uncertain Ivy all have their own secrets to keep from her — the kind of secrets that if revealed could bring disaster down upon not only them, but the entire kingdom.

Waiting in the wings is stepbrother Wylm whose dealings with Bluebell's greatest enemy, Hakon the Raven King, would end Bluebell's dreams of revenge on his mother and propel his own desperate grasp for power.