Books like The Mummy Case
Carolyn Keene, Leslie H. Morrill
The Mummy Case is 180 pages, about 3 hours 18 minutes at 250 words a minute.
12 books to read next
How long each takes
The Witches 3.8 h 
Don't Let the Pigeon Drive the Bus! 44 min 
Encyclopedia Brown, Boy Detective 1.9 h 
Are You My Mother? 1.2 h 
Rumble Fish 2.3 h 
Stone Soup 53 min 
Curious George 59 min 
Fables 44 min 
Story About Ping 35 min 
Leo the Late Bloomer 35 min 
The Reason for a Flower 51 min 
Leo the Lop 35 min Bar height shows length. Estimated at 250 words a minute.