Corean Chronicles, book 8: Lady-Protector
L.E. Modesitt2011

A new novel of Mykella, the young woman introduced in The Lord-Protector's Daughter. Though a bloody coup has made Mykella ruler of her land, it has left her and her two sisters bereft of family and uncertain of their friends. Worse, an examination of the nation's accounts reveals that their country is almost destitute. Plus, there are rumblings of war along the borders. With no money and few allies, Mykella is faced with the difficult prospect of rebuilding her nation while trying to hold off a potentially devastating invasion.

Fortunately for Mykella, an old magic has awakened in her; a power that gives her the ability to read the emotions of others and to spy on the movements of her enemies. But the resurgence of this power might herald the return of an ancient enemy, one that Mykella isn't sure how to face.