The story is set in a world where Shadowhunters (Cazadores de Sombras) and Shadows of the Full Moon (Sombras del Plenilunio) have been locked in a survival struggle for centuries.

The narrative alternates between a present-day Cristal and her past.

Reviewers from Goodreads and Babelio highlight several key aspects of the book:

As a new type of warrior, Cristal becomes a pivotal "weapon" desired by both sides of the ancient war, forcing her to choose between her burgeoning love and her ideals. Review Analysis