It resolves the story told in the first two books; additionally, it settles several plot threads which originated in the previous trilogy, Arrows of the Queen.
Meanwhile, Heralds Elspeth and Skif witness the reunion of Clan k'Leysha, a tribe of Hawkbrothers which was divided because of a magical mishap.
Firesong's Gate (a magical portal enabling the person to cross large distances in a single step) is co-opted by the ghost of Herald Vanyel, a Herald-Mage who died saving the kingdom.
The victim of the most recent takeover, An'desha, a boy of the Shin'a'in, survived; his personality took refuge in a hidden corner of Falconsbane's mind.
At the close of the book, An'desha and Nyara are healed from the damage Falconsbane had done to their bodies, and the party settles in to live in Haven.