Books like Missing Since Monday
Ann M. Martin
Missing Since Monday is 167 pages, about 3 hours 4 minutes at 250 words a minute.
12 books to read next
How long each takes
The Tower Treasure 3.3 h 
The Leaving 8.2 h 
The Case of the Left-Handed Lady 4.7 h 
The Absent Author 1.6 h 
The Rescue 2.9 h 
Stolen Children 3.0 h 
The Missing Chums 3.2 h 
The Radio Mystery 2.4 h 
The Summer Camp Mystery 2.1 h 
Skink--No Surrender 5.3 h 
Peppe the Lamplighter 35 min 
Dark Places 6.8 h Bar height shows length. Estimated at 250 words a minute.