How far would you go for love?
 
When 16-year-old Cyrus learns that her lifelong friend and crush, Soren, is overtaken by a sinborn—a demon thriving on inner darkness—she's faced with an impossible choice. To save him, she must become a sineater, one who absorbs these sinister entities. But with every sin she takes in, a piece of her fades.
 
As Cyrus delves deeper into this shadowy world and grapples with her own fading identity, she's forced to confront a pressing question: How much of herself is she willing to lose to save the one she cares for most? Will she and Soren find light, or will darkness consume them both?