Shattered Oaths and Siren Songs. The Lethal Glamour Series, #3

Commander Alaric Thorne is a weapon--cold, efficient, and bound by a centuries-old oath to the vampire crown. His value lies in his obedience, and his latest mission is simple: conduct the Lineage Audit at the Lethal Glamour Resort and execute any hidden threats. But when he meets Elara, the resort's seemingly compliant concierge, the iron armor around his heart begins to crack. Elara is an empath hiding a lethal secret.
She is the last of the Sea-King sirens, living a life of invisibility to survive the genocide that erased her ancestors. She's spent years smoothing over the jagged emotions of the vampire elite, but she cannot smooth over the arrival of the Royal Guard. To be seen is to die, yet under Alaric's intense monitoring, she finds herself craving the very gaze that could destroy her. As the Audit tightens like a noose, Alaric and Elara are forced into a dangerous game of proximity and passion.
He was sent to be her executioner, but he's becoming her clandestine guardian. She was born to be a weapon of destruction, but she's finding the courage to use her sovereign voice. With the Empress's blade looming, Alaric must choose: his ancient oath to the crown, or the siren whose song has finally brought him to life. Can two enemies bound by duty and fear find a way to rewrite their destiny, or will their shattered oaths drown them both?