Mirror of Argent. Blood of the Fae, #4

Masquerades, monarchs, and . . . misalliances?All her life, Jessa Caldwell has feared the Vigil-and now they've claimed her. Worse yet, they're not acting alone. Someone directs their every move, someone all too interested in Jessa-and her sisters. Even if she breaks free of her unnatural prison, the Vigil will not so readily relinquish their claim, nor will the unknown fae who hunts her across realms.
As she struggles to clear her name, protect her family, and uncover the truth about her past, she soon finds herself in the center of a conflict that threatens both worlds, an age-old menace capable of harming mortal and fae alike. In partnership with fae arbiter Riven and her bonded kit-isne Jade, Jessa strives for a path that will keep endangered innocents safe-no easy task when someone is making her out to be the threat.
To have any chance of saving that which she loves, she must forfeit it all for a world of court rivalries, power games, and treacherous bargains, where no one is what they seem. If she can't discern truth from illusion in time, she'll lose not only her family, but also her very self.