Call of the Shadow Rift. Book of the Doomshroud, #1

A throne held together by will. A kingdom tearing itself apart. And a queen running out of time. Two years have passed since Kaeri Venador won the crown of ahara and the right to rule Montagn-but ruling is proving far more dangerous than she expected. Montagn is brittle with resentment. Powerful Houses challenge Kaeri's authority at every turn, old alliances strain, and the hard choices that secured her throne now threaten to tear it apart.
Every decision she makes risks unrest, rebellion, or the undoing of everything she fought to change. When events force Kaeri beyond the protection of her House and crown, power takes on a different meaning. Stripped of certainty, she is forced to rely on a handful of people she does not know and cannot afford to trust-including the enigmatic Nightbird, whose presence raises as many questions as it answers. And the most dangerous threats might be the ones no one believes in.
While Montagn's attention remains fixed on politics and power, rumours from the rebel port of Avarai go unheeded. Stories of monsters in the night. But what if they're not just stories?