Ruin & Rising – Leigh Bardugo

Blurb: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.Deep in an ancient network of tunnels and caverns, a weakened Alina must submit to the dubious protection of the Apparat and the zealots…