As a solider-in-training at the most prestigious barracks in the kingdom, Sairose lies about being a siren to avoid execution. At night, working as an assassin for a dangerous group of mercernaries, she lies about her true identity. And to her family, Saoirse tells the biggest like of all: that she can control her siren powers and doesn't struggle constantly against an impulse to kill. As the top trainee in her class, Saoirse would be headed for a bright future if it weren't for the need to keep her secrets out of the spotlight. But when a mysterius blackmailer threatens her sister, Saoirse takes a dangerous job that will help her investigate: she becomes personal bodyguard to the crown prince. Saoirse should hate Prince Hayes. After all, his father is the one eho enforces the kingdom's brutal creature-segregation laws. But when Hayes turns out to be kind, thoughtful, and charming, Saoirse finds herself increasingly drawn to him -- especially when they're forced to work together to stop a deadly killer who's plaguing the city. there's only one problem: Saoirse is that deadly killer.