Chains Carried on Wings (Clydian Chronicles, #1) by Marina Ermakova

SPFBO6

Saig had always lived on the edge of acceptance. Unlike a proper daughter of the head family, she longed for the freedom of the open woods over the confinement of her home. It was enough to drive away the two people who should, by rights, have been her closest companions. But her perfect, responsible cousin Auris--destined to be the city's headwoman and resentful of Saig's inability to conform--would never be her friend again. And her surly cousin Trei--aware of how his foreign ancestry undermined his own standing in society--would always look at her as a reminder of their shared differences. Until a series of mysterious disappearances forces all three of the cousins onto the same side. Driven to protect their city and prove themselves, they join the effort to hunt down the perpetrators. What they find is a trap designed to bring their society crashing down, and the power to reshape their city's future. There's just one problem--the three of them have always bitterly disagreed on what that future should look like.