When fifteen-year-old Æthelflæd is suddenly and reluctantly betrothed to an ally of her father, the king, her world will never be the same. For as a noblewoman in the late 800s, she will be expected to be meek and unlearned-and Flæd is anything but meek and unlearned. Her marriage will bring peace to her land, but while her royal blood makes her a valuable asset, she is also a vulnerable target. And when enemies attack, Flæd must draw upon her skills and fight to lead her people to safety and prove her worth as a princess-and as a warrior.