Brown, Rina "Acceptance in Ice" Book 2 of Isle of the Dark Series

Enjoying life as never before, Ranger has embraced his resurrection and adopted Isle, the Datsoe he captured for execution. His formidable reputation prevents any prejudice Isle may face, even from the King. Asked to escort The Monomer's back to the ice kingdom of Ococna by the lovely Lady Francine, Ranger accepts.
Attacked by a pack of vicious Datsoes along the way, Ranger and Isle are isolated from the royal procession by an avalanche. Discovering a portal to a forgotten race called the Asalairi hidden deep within the mountains, the Datsoe plague becomes a distant shadow as they meet new friends and discover secrets from Ranger's past. Distracted by a foe called the Spirit Stealer, tempted by the lure of an unclaimed throne, the seasoned warrior has no idea he is being stalked by a murderer who will let nothing stand in the way of power.
In this breathtaking sequel to "Isle of the Dark", can Isle save Ranger in time, or will he lose everything to the gathering dark forces that threaten to claim them all?