What do you do when you're ordered to kill the only man you've ever loved?

Follow through, of course…

The princesses of House Sun are not known by name or face. They are known only as vipers. Nine assassins who serve The Serpent, ruler of Solaria. Celeste is the last viper to be dispatched. Her mission is crucial: infiltrate the Lunar kingdom and kill The Demon Prince. Simple. There's only one problem. Apollo Alceline of House Luna is a mark unlike any other.

Apollo knows all too well how fatal The Serpent's bite can be. It cost him his mother, his hearing, and his father his sanity. That's why when the Lunar king suddenly passes, and Apollo takes his place, he knows he must uphold his dying wish-to see The Serpent burn. So when a beautiful viper, dangerous and cunning, with skin blessed by the light, is thrust into his lap, he knows he cannot let her linger. But as Celeste spends more time in the shadows, Apollo finds himself desperate to taste the sun.

The fight for the celestial planes has reached a fever pitch. Apollo and Celeste stand at the center, orbiting the inevitable collapse. But before the sun eclipses the moon, they must decide where their loyalties lie-to their houses or each other.

This high-stakes fantasy romance offers a unique take on star-crossed lovers amidst a one-of-a-kind magic system with a diverse cast of characters, including a Black heroine and a deaf male love interest.