Esmerelda Santos is a rare bruja, born with Chaos magic in her veins. She and her family are direct descendants of one of the four original witches, a mysterious legend about the night magic was born in San Bosco. But since the death of her mother, Esme is more concerned about healing their father's spiraling grief. When Esme finds a heart spell in a forbidden grimorio, she thinks it could be the answer to making her dad whole again. But before she can try, she and her best friend, Tiago, discover that their families and all the town's witches have vanished, along with their magic, which keeps San Bosco alive. The only way to save them and the town is to find an original witch, impossible, since no one has actually ever seen one. With a witch hunter on their tail, Esme and Tiago journey to a banished realm where forbidden magic runs wild. Here the two must embrace their powers and confront the legend's terrible truths... or risk losing their families and their magic forever.