In a world starkly divided by blood, Mare Barrow's Red lineage relegates her to a life of oppression, shadowed by the ruling Silver-blooded elite endowed with superpowers. Mare's fate hangs by a delicate thread when she inadvertently reveals her own extraordinary ability amidst the Silver elite. To obscure the truth, the king coerces Mare into masquerading as a Silver princess, betrothed to a royal son. Her perilous charade intertwines her with the Scarlet Guard's uprising, as she balances on a razor's edge between subterfuge and rebellion, love and betrayal, with only treachery as her certain companion.