Sisters of Shadow and Light by Sara Larson

Zuhra and Inara have grown up in the Citadel of the Paladins, an abandoned fortress where legendary, magical warriors once lived before disappearing from the world–including their Paladin father the night Inara was born. On that same night, a massive, magical hedge grew and imprisoned them within the citadel. Inara inherited their father’s Paladin power; her eyes glow blue and she is able to make plants grow at unbelievable rates, but she has been trapped in her own mind because of a “roar” that drowns everything else out–leaving Zuhra virtually alone with… Read more.