This book has a lot of hard puzzles and it is so fun to see how the characters find the answers in ways you would not expect and it was a splendid read. My favourite part in the book was when they found out where the bad guy was. The reason I liked it was because the marshland had been buried far under the ground which was a fun conclusion to the book.
The part where they found the horrible hound was quite nerve-racking because it was about to eat someone so poor. The reason I said poor was because both of his brothers had died and he was petrified.You can see how a detective this good would be very unreal but in a very cool way.
This book was a big roller coaster of emotions and I hope to read more mystery books in the future. This book was a solid 4 stars and I would really recommend it to anyone who like mysterious books.