Books like The Mona Mousa Code
Gerónimo Stilton
The Mona Mousa Code is 124 pages, about 2 hours 16 minutes at 250 words a minute.
12 books to read next
How long each takes
One False Note 3.2 h 
The Viper's Nest 3.2 h 
A King's Ransom 3.5 h 
Mouse Paint 35 min 
The Water-babies 5.0 h 
Dog Man 4.4 h 
Oil Paints 35 min 
The 39 Clues 3.8 h 
Runaway Ralph 3.2 h 
The Mouse and the Motorcycle 2.9 h 
Beyond the Grave 3.5 h 
The Mystery of the Shrinking House 2.8 h Bar height shows length. Estimated at 250 words a minute.