To Kill A Prince by Katherine MacDonald

A prince without sight. A spy without loyalty. A love without a future.

Wren has spent her life walking the fine line between two worlds—half-fey, half-human, and wholly untrustworthy in the eyes of both. But it is her unique ability to lie that makes her valuable. When her grandmother, a ruthless fae enchantress, places her in the service of Prince Cassiel—the recently blinded second son of the realm—Wren knows she’s meant to earn his trust… and, eventually, take his life.
It should be easy. Cassiel hates the fey who stole his sight, and he’s just as sharp-tongued and impossible as the rumours say. Wren just has to keep her distance. Yet, as she helps him navigate his new reality, she realises that beneath the bitterness is a man who is fiercely intelligent, deeply wounded, and entirely too compelling. And worse—he’s beginning to trust her.

As tensions between humans and fae ignite into war, Wren is forced to choose between the family who raised her and the man she was never meant to love.
But Cassiel isn’t as blind as he seems, and if he discovers the truth about her, she may not live long enough to make that choice at all…