"The Monstrumologist" is a novel by Rick Yancey that follows the story of a young orphan named Will Henry in the late 19th century. He works as an assistant to Dr. Warthrop, a scientist who studies monsters. The narrative explores themes of fear, morality, and the nature of humanity as they confront terrifying creatures. Set in a dark and atmospheric world, the book delves into the relationship between Will and Dr. Warthrop, highlighting their struggles against both external monsters and internal demons. The story combines elements of horror and adventure, making it a compelling read for fans of the genre.