In short: The Isle of Blood by Rick Yancey supplies yet another terrifying monster, but most importantly, provides the reader with thoughtful and developed characterization. 
 Will Henry and the Monstrumologist are back and this time the monster they are hunting is the Typhoeus magnificum, the father of all monsters. Infection caused by the magnificum results in zombie-like humans, whose skin rots and grows protruberances, and whose appetite becomes insatiable, often leading the individual to consume their own bodies if no human meal is in reach. It is a terrifying and disgusting monster - and I would expect no less from Rick Yancey, who in the past has brought us the likes of the Anthropophagus and the Wendigo. 
 As well done as the horror aspect and the monsters are in The Monstrumologist Series, the real life aspect and the characters are truly what makes these books, which I fear is not something I've sufficiently gotten across in my previous reviews for this series. After all, if all these books entailed were monsters and gore, they really wouldn't have very much substance at all and I would have no interest in reading them. As it is, the character development in The Isle of Blood was the best part of the novel, with both Will Henry and the Monstrumologist evolving significantly, yet naturally. 
 One thing that I love about this series are the cameos of real life historical figures. Jack the Ripper and Bram Stoker have significant roles in The Monstrumologist and The Curse of the Wendigo, respectively. In The Isle of Blood, Jack the Ripper is back in all his horrible and cruel glory. Arthur Conan Doyle also takes part in the story during a critical scene. It's super fun to see the many ways Rick Yancey comes up with to somehow integrate these cameos into the story. 
 Though I did have some minor problems with the pacing, The Isle of Blood is a magnificent addition to the Monstrumologist Series. I know I mention it every time I write a review for this series, but they really are some of the best written books I've ever read. The imagery created with Rick Yancey's words is achingly beautiful. Add to that the fact that the writing just seems to get even better - more poetic - with each book, if that is even possible. I'm already looking forward to the newly announced fourth book in the series!