Bardugo, Leigh. Grisha trilogy #3

"Soldier. Summoner. Saint. The nation's fate rests with a broken Sun Summoner, a disgraced tracker, and the shattered remnants of a once-great magical army. 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"--

Ages 12-18

"The Darkling rules Ravka from his shadow throne. 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" provided by publisher

Grades 10-12