Books like Gemma and Sisters
Noel Streatfeild
Gemma and Sisters is 208 pages, about 3 hours 49 minutes at 250 words a minute.
12 books to read next
How long each takes
Dark Places 6.8 h 
The Yellow House Mystery 3.5 h 
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Vespers Rising 4.1 h 
Peppe the Lamplighter 35 min 
The Replacement 6.3 h 
Family Sabbatical 5.9 h 
Superfudge 3.1 h 
Mission Unstoppable 5.4 h 
The London Eye Mystery 6.0 h 
Deep and Dark and Dangerous 3.4 h Bar height shows length. Estimated at 250 words a minute.