Imprisoned by the boy she once loved, Mare Barrow is trapped in the king's cage. Stripped of her power and haunted by her past mistakes, she is under the control of Maven Calore—the deceiving king with a twisted heart.

Behind the palace walls, Mare's allies—the newbloods and Reds—are rallying. Preparing for an impending war, they risk everything to free her and ignite a rebellion.

Meanwhile, Cal, the exiled prince and another of Mare's love interests, is determined to rescue her. As conflicts intensify within the kingdom, loyalties are tested and betrayals lurk around every corner.

In a world on the brink of destruction, can Mare find the strength to escape and save everything she holds dear? Or will the darkness swallow them all?