Sixteen-year-old Sienna Sullivan is a Light Lacer. She has the ability to conjure light magic, foster life, and gains power through the sun. Along with others of her kind, Sienna grew up on a secure reservation where life was predictable and stable... until Tobias Hail arrived. Tobias is different from other Lacers. He is dark and withdrawn, and when Sienna is partnered with him to complete an assignment, she learns that there is more danger in the outside world than she realised. As her life begins to crumble around her, Sienna uncovers some unsettling truths about herself. She is then forced to trust some unlikely allies to outrun those who threaten the very existence of Light Lacers.