Maerad is a girl with a tragic and bitter past, but her powers grow stronger by the day. Now she and her mentor, Cadvan, pursued by both the Light and the Dark, are seeking the Riddle of the Treesong - the key to restoring peace in the ravaged kingdom. But is Maerad herself the greatest riddle of them all? Maerad's epic quest continues as she travels from terrifying seas to vast stretches of glacial wilderness, drawn ever closer to her enemy the Winterking.

In an increasingly battle-ravaged land, Maerad, Cadvan, and Hem desperately search for one another as they make their separate journeys. The Black Army is advancing north, and even as Maerad faces a mighty confrontation with the Landrost to save Innail, all of the Seven Kingdoms are threatened with bitter and devastating defeat. Yet in Maerad and Hem lives the secret to the mysterious Singing, and legend holds that if they release the music of Elidhu together, they have the power to defeat the Nameless One.

Maerad is a slave in a desperate and unforgiving settlement, taken there as a child when her family is destroyed in war. She is unaware that she possesses a powerful gift, a gift that marks her as a member of the School of Pellinor. It is only when she is discovered by Cadvan, one of the great Bards of Lirigon, that her true heritage and extraordinary destiny unfolds.

Liobhan, the young warrior and bard, has lost her brother to the Otherworld. Even more determined to gain a place as an elite fighter, she returns to Swan Island to continue her training. But Liobhan is devastated when her comrade Dau is injured and loses his sight in their final display bout. Blamed by Dau's family for the accident, she agrees to go to his home, Oakhill, as a bond servant for one year. But Oakhill is a place of dark secrets. 

In Eileanan, victory has finally been won, and those of faery kind - from the mighty dragons to the mysterious nyx - have sworn their friendship and aid. Only the sea-dwelling Fairgean have refused to sign the Pact of Peace. Driven by ancient hatreds, they have devoted themselves to destroying all who dwell upon the land. Troubled by the darkness that may lie ahead, Lachlan agrees to release his beloved Iseult from the sacred oath that binds them together. It will then be for Iseult to decide whether she will remain in the mountains to resume life with her own kin, or return.