First published 2014
Will Henry has survived fourteen years as apprentice to the monstrumologist Dr. Pellinor Warthrop. He has stared death in the face multiple times and gazed into hell itself. Through every terror, Warthrop stood beside him. Now the doctor suspects Will's loyalty is wavering. In a burst of rage, Warthrop abandons his young apprentice, determined to win back his complete devotion. Will must confront one of the most terrible creatures in his monstrumology experience without his mentor's guidance. In the underground chambers of the Monstrumarium, over the span of a single day, both Will's survival and Warthrop's fate will be determined. The monster they encounter surpasses anything from their previous cases. Will faces not only this physical threat but the emotional devastation of his mentor's betrayal. The bond between teacher and student fractures at the moment Will needs support most.
Genres: mystery, fantasy, horror, young-adult
Vibes: dark, emotional, suspenseful
Tropes: enemies-to-lovers, mentor-protege
Setting: Monstrumarium
Period: 19th-century
310 pages · Paperback · Simon & Schuster Books for Young Readers
Content warnings: body-horror, graphic-violence