This is book number 3 in the Grisha Trilogy series.
The much-anticipated conclusion to the Grisha Trilogy
The capital has fallen. The Darkling rules Ravka from his shadow throne. Now the nation's fate rests with a broken Sun Summoner, a disgraced tracker, and the shattered remnants of a once-great magical army.
Hidden away, a weakened Alina must submit to the dubious protection of the Apparat and zealots who worship her as a Saint. Yet her plans lie elsewhere, with the hunt for the elusive firebird and the hope that an outlaw prince still survives.
Alina forges new alliances as she and Mal search for Morozova's last amplifier. But as she begins to unravel the Darkling's secrets, she reveals a past that alters her understanding of the bond they share and the power she wields. The firebird is the one thing that stands between Ravka and destruction--and claiming it could cost Alina the future she's fighting for.