Isla, a quiet weaver's daughter with a flickering luminescent touch, is thrust into a hidden war when her town is attacked by monstrous, shadow-born creatures. Captured and branded with a strange magical mark, she discovers she is a Lumen, one of the rare beings with the potential to wield elemental light. Isla must flee her home, seeking refuge in a secret order of Lumens while pursued by relentless forces seeking to harness her newfound power.