Shadow Study by Maria V. Snyder — book slip

Yelena, once a poison taster, now plays a crucial role in maintaining peace between the rival nations of Ixia and Sitia.

Her magical abilities and sharp intellect are key to her success, but when her magic is mysteriously blocked, she must rely on her wits to uncover the sinister plots threatening the fragile peace.

As old rivalries resurface and her relationship with Valek is tested, Yelena must navigate a world of political intrigue and danger without her powers.

First in the Soulfinder Series by Maria V. Snyder.