My Mate, The Mercenary

Princess Kiva's world shatters when her personal guard is murdered and she's attacked in her own room. Just as death seems certain, her attacker recoils – a shockwave reveals he is her fated mate. But he's a killer, and her father hires an infamous mercenary, Ark, as her new guard and trainer. Kiva must navigate her growing attraction to the cold, lethal man assigned to protect her, while uncovering the truth about the attack and her mate's true intentions, all before her father finds and executes him.
The silence of the manor is shattered by a scream, the sound of breaking glass, and a heavy thud. Princess Kiva is woken from her sleep by the commotion. Her personal guard, Andri, is dead outside her door, and an intruder enters her room. Just as she faces certain death, a shocking revelation stops her attacker – he is her fated mate. He vanishes, leaving Kiva reeling and the sounds of the invaders retreating.