The Frozen Prince — Maxym M. Martineau

I will fight for her
For us
Until I have nothing left to give.

Noc, leader of the assassins of Cruor, is living on borrowed time. If he fails to kill his final mark, his own life will be forfeit. To make matters worse, his true identity as the former Frozen Prince has fallen into the hands of his enemies. . . putting the lives of everyone he loves in more danger than ever. With the dark magic of Cruror's Oath testing his control and ancient enemies hounding his footsteps, Noc has to fight with everything he is to keep the woman he can't live without safe.

Leena is finally coming into her own as a powerful beast charmer and she would do anything to help Noc overcome his dark oath. So when she hears of a beast rumored to have the power needed to save Noc's life, she is quick to embark on an expedition to the frozen north. But what starts as a hunt for a magical beast quickly turns Leena and her trusted band of assassins into prey. . . and time is running out.