Trained as an elite assassin for her own protection, seventeen-year-old Princess Kayden Branimir is dangerous enough without her rare magic that her foes seek to use to conquer domains. When she receives a cryptic letter from her supposedly dead twin sister claiming she is in Leodia, rival territory, and in need of help, Kayden will risk anything to find her. And that includes hunting down and killing the Leodian war generals that threaten her domain and her family, all while using an alias. Eighteen-year-old Zara Tait, a spy for the Leodian queen, wants nothing more than to leave her queen's service, but she knows she'll wind up dead if she tries. Then her chance unexpectedly comes when the Leodian queen offers Zara release from her duties if she completes one last assignment: track down Kayden, whose powerful energy is seen as a threat, and learn what her magic is capable of. But Zara didn't consider that she'd grow close to Kayden. A little too close. As Zara unearths Kayden's true identity, she must decide between her freedom and the girl she hadn't meant to fall for. Knowing her presence hasn't gone unnoticed, Kayden needs to find her sister and assassinate the generals before she gets caught. Or worse--before someone discovers her magic. But when the Leodian queen catches on to Zara's wavering loyalty, she threatens to kill everyone Zara loves if she fails this assignment. One choice will lead to the deaths of everyone Zara knew; one will bring destruction to entire domains.