The Apothecary's Daughter

Don't Think Twice. Just Shoot.
At the height of a centuries-old war, Sara Keelan's loyalty to Zandor is crushed when she is the sole witness to a brutal massacre. If the wrong people discover she knows the truth, they will slaughter her, too.
Presented with an opportunity to strike back against the lying regime, Sara takes a desperate chance and uncovers a terrifying plot. Ensnared by expectations from both sides, she races an unexpected adversary to end a rebellion and restore a throne.
An apothecary's duty is to heal, but Sara's skills may cause irreparable harm.
Three nations. One chance to end 385 years of hostilities...