Sylvan, a young healer capable of perceiving spirits, lives with his teacher. Together they treat patients and sell remedies from a cabin in the woods under the cover identity of Hyacinth. Despite having been raised by her, Sylvan always felt that he did not know his true past, as she seemed to be hiding hidden truths. After the sudden death of his mentor and the discovery of chronicles revealing the woman's true name, Sylvan begins to question everything he thought he knew about his origins. Upon inheriting the business, he receives a visit from a royal envoy who forces him to infiltrate the nobility and the slums to investigate the origin of the plague. With unexpected allies and his secret identity at stake, Sylvan must not only face the epidemic that is decimating the kingdom, but also unravel the political and spiritual secrets that threaten to destroy his world.