Hopeless Reign (The Knight Heir Series) (Volume 1)
Dove Winters, author
Ginny doesn't want to be queen. Known as the mead-loving, trouble-making princess of Newrock, all she wants is for her beloved little brother to marry, so he can assume the throne and she can disappear. But when tragedy befalls her kingdom and pushes the crown into her hands, she's forced to face her worst nightmare. Surrounded by betrayal and the threat of death, her only thought is to save her little brother--even if it means giving herself over to the enemy.