Books like Cherub 10 The General
Robert Muchamore
Cherub 10 The General is 354 pages, about 6 hours 29 minutes at 250 words a minute.
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Spy Ski School 6.4 h 
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Chains 6.0 h 
Escape 2.3 h 
Crocodile Tears 7.1 h Bar height shows length. Estimated at 250 words a minute.