When Dr. Warthrop goes hunting for the "Holy Grail of Monstrumology" in 1888, twelve-year-old orphan Will Henry follows him to Socotra, plunging into depths of horror worse than anything he has experienced so far.
A terrifyingly clever serial killer, the most obscure and fascinating monster of all time, and romance all appear in the third chilling book in the Monstrumologist series. When Dr. Warthrop receives a nidus, a revolting nest made of human innards mingled with star rot, a token of the Unseen One, he runs off to an African island to locate it. 13-year-old Will is left behind, to attempt a normal life after his dangerous years with the doctor. However, when Will receives word that the doctor is dead, he's suspicious, and travels to London to find out the truth for himself. Once there, Will finds himself in the most terrifying adventure of his young life. Meant to be a trilogy, the publisher amended the plan to include a fourth book in the Monstrumologist series after a massive fan write-in campaign.
- Genre: Juvenile Fiction
- Subgenre: General, Legends + Myths + Fables / Other, Horror + Ghost Stories, Action + Adventure / General
- Age: Teen
- Publisher: Simon & Schuster
- Pages: 558
- Language: English
- Format: hardcover
- Release Date: September 13, 2011
- Date Published: September 13, 2011
- Author: Rick Yancey