The Darkling rules from his shadow throne while a weakened Alina Starkov recovers from their battle under the dubious protection of the zealots who worship her as a Saint. Now her hopes lie with the magic of a long-vanished ancient creature and the chance that an outlaw prince still survives.

As her allies and enemies race toward war, only Alina stands between her country and a rising tide of darkness that could destroy the world. To win this fight, she must seize a legend's power - but claiming the firebird may be her ruin.