Saoirse Sorkova survives on lies. As a soldier-in-training at the most prestigious barracks in the kingdom, she lies about being a siren to avoid execution. At night, working as an assassin for a dangerous group of mercenaries, Saoirse lies about her true identity. And to her family, Saoirse tells the biggest lie 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 mysterious 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 who 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. Featuring an all Black and Brown cast, a forbidden romance, and a compulsively dark plot full of twists, this thrilling YA fantasy is perfect for fans of A Song Below Water and To Kill a Kingdom.