Saoirse Sorkova survives on secrets. As the last siren in her kingdom, she can sing any man to an early grave - but her very existence is illegal, and if her true identity were ever discovered, it would be her life on the line. By day, Saoirse disguises herself as a fae, pretending to be the perfect soldier-in-training. By night, she satisfies her darker urges working as an assassin for dangerous mercenaries. And all the while, she keeps the biggest secret of all: that she is not always in control of her Siren powers, or her desire to kill. Then a blackmailer threatens her sister, and Saoirse's investigation takes her to the royal palace, and her most dangerous job yet: personal bodyguard to the Crown Prince. Saoirse expects to despise Prince Hayes. But he is kind, thoughtful, and charming, and she finds herself increasingly drawn to him . . . until he tasks her with investigating a killer plaguing the kingdom. The problem: the killer is Saoirse.