The Betrayer - Hannah E Carey - Bog

A broken warrior. A broody outcast king. And a darkness that threatens to destroy them both.

Niall never imagined he would become king, nor did he ever imagine that he would be granted the abilities of a seer. His unnatural power, however, has proven to be no great gift, for it has already cost him the woman he loves and it threatens to cost him his kingship. His people already don't trust him and if they knew of his power, they would view him as nothing more than a monster.
Niall's future looks grim, but a twist of fate returns Ciara to his life when he least expects it. He latches onto the hope of a different future, only to discover that things have changed while he has hidden away in his castle. When the man Ciara trusted the most disappeared, she turned to his brother, a man she never saw herself falling for.
Bleddyn has shown Ciara that there is more to him than she first thought and she has carved out a life at his side, but things are unsettled on the island of Pern Coen. A dark power is stirring, one that hasn't been seen in decades. One man is at the center of the growing darkness, but is it the man that Ciara, and the people, think? Is Niall innocent or is he hiding more than just his powerful abilities?

This Celtic inspired romantic fantasy features strong world building, a broody outcast king, a broken warrior heroine, sibling rivalry, political intrigue, dark magic, found family, and low spice romance.