About this book:

"The Apothecary's Grimoire" tells the story of Elsbeth, an informal apprentice, and Matthais, a formal apprentice, working under Master Benedick in Oakhaven during a devastating plague year in 1348. As the plague rages, the city descends into fear and superstition, leading to Master Benedick's arrest on charges of sorcery and heresy due to his alchemical practices. Elsbeth and Matthais are forced to flee, carrying with them a makeshift "Grimoire" of Benedick's remedies and observations, determined to preserve his knowledge.

Their journey leads them to a secluded mill, where they uncover further evidence from a former apprentice, Gerhard of Bremen, who believed the plague stemmed from a "wound in the earth." This discovery, along with their own observations, reveals a terrifying truth: mass burials near the city's water sources are contaminating the soil with iron and sulfur compounds, which then spread through the water and grain supply, sickening the populace. This scientific explanation challenges the prevailing belief that the plague is divine punishment, putting Elsbeth and Matthais at odds with the powerful Brother Corvin, who champions a narrative of spiritual retribution.

Returning to Oakhaven, Elsbeth and Matthais present their findings to a skeptical Guild and Bishop's inquiry. A dramatic demonstration in the pesthouse, using soil and water samples, highlights the chemical basis of the plague. Their testimony, along with revelations about an ancient medical library hidden beneath Benedick's shop, leads to Benedick's acquittal from sorcery charges, though he is condemned for practicing without ecclesiastical sanction. His sentence is to collaborate with Dr. Hartmann and his apprentices to implement widespread sanitary reforms.

Despite initial successes, including the cleaning of mills and closing of contaminated wells, Brother Corvin continues his opposition, using the death of a child from seemingly clean water to reinforce his narrative of divine judgment. However, Elsbeth and Matthais persevere, painstakingly documenting every observation and measurement in their Grimoire. Ultimately, the book becomes a "Grimoire of the Living," a testament to the power of methodical observation and the enduring struggle to bring scientific truth to a world often resistant to it, ensuring that the knowledge of the ancient ones, and Master Benedick's legacy, will continue to serve those who seek healing.