"Monstrumologist" is a novel by Rick Yancey that follows the story of a young apprentice named Will Henry who works with a scientist, Dr. Warthrop, specializing in the study of monsters. Set in the late 19th century, the book explores themes of fear, morality, and the nature of humanity through the lens of monstrous creatures. The narrative combines elements of horror and adventure, as Will and Dr. Warthrop confront various supernatural beings, including wendigos and other mythical entities. The story delves into the complexities of their relationship and the ethical dilemmas faced in the pursuit of knowledge about the unknown.