Severed from the Legendborn. Oathbound to a monster. Bree Matthews is alone. She exiled herself from the Legendborn Order, cut her ancestral connections, and turned away from the friends who can’t understand the impossible cost of her powers. This is the only way to keep herself—and those she loves—safe. But Bree’s decision has come with a terrible price: an unbreakable bargain with the Shadow King himself, a shapeshifter who can move between humanity, the demon underworld, and the Legendborn secret society. In exchange for training to wield her unprecedented abilities, Bree has put her future in the Shadow King’s hands—and unwittingly bound herself to do his bidding as his new protégé. Meanwhile, the other Scions must face war with their Round Table fractured, leaderless, and missing its Kingsmage, as Selwyn has also disappeared. When Nick is detained by the Order’s Merlins, he invokes an ancient law that requires the High Council of Regents to convene at the Northern Keep and grant him an audience. No one knows what he will demand of them...or what secrets he has kept hidden from the Table. As a string of mysterious kidnappings escalates and Merlins are found dead, it becomes clear that no matter how hard Bree runs from who she is, the past will always find her.

The shadows have risen, and the line is law. All Bree wanted was to uncover the truth behind her mother’s death. So she infiltrated the Legendborn Order, a secret society descended from King Arthur’s knights—only to discover her own ancestral power. Now, Bree has become someone new: A Medium. A Bloodcrafter. A Scion. But the ancient war between demons and the Order is rising to a deadly peak. And Nick, the Legendborn boy Bree fell in love with, has been kidnapped. Bree wants to fight, but the Regents who rule the Order won’t let her. To them, she is an unknown girl with unheard-of power, and as the living anchor for the spell that preserves the Legendborn cycle, she must be protected. When the Regents reveal they will do whatever it takes to hide the war, Bree and her friends must go on the run to rescue Nick themselves. But enemies are everywhere, Bree’s powers are unpredictable and dangerous, and she can’t escape her growing attraction to Selwyn, the mage sworn to protect Nick until death. If Bree has any hope of saving herself and the people she loves, she must learn to control her powers from the ancestors who wielded them first—without losing herself in the process.

After her mother dies in an accident, sixteen-year-old Bree Matthews wants nothing to do with her family memories or childhood home. A residential program for bright high schoolers at UNC–Chapel Hill seems like the perfect escape—until Bree witnesses a magical attack her very first night on campus. A flying demon feeding on human energies. A secret society of so called “Legendborn” students that hunt the creatures down. And a mysterious teenage mage who calls himself a “Merlin” and who attempts—and fails—to wipe Bree’s memory of everything she saw. The mage’s failure unlocks Bree’s own unique magic and a buried memory with a hidden connection: the night her mother died, another Merlin was at the hospital. Now that Bree knows there’s more to her mother’s death than what’s on the police report, she’ll do whatever it takes to find out the truth, even if that means infiltrating the Legendborn as one of their initiates. She recruits Nick, a self-exiled Legendborn with his own grudge against the group, and their reluctant partnership pulls them deeper into the society’s secrets—and closer to each other. But when the Legendborn reveal themselves as the descendants of King Arthur’s knights and explain that a magical war is coming, Bree has to decide how far she’ll go for the truth and whether she should use her magic to take the society down—or join the fight.