Earl Derr Biggers books in order
5 books in the catalogue, about 25 hours of reading in all; the shortest takes 4 hours and the longest 6 hours.
1 series and 2 standalone books in the catalogue.
Charlie Chan
6 books
The Chinese Parrot 5.8 h 
The House Without a Key 4.3 h 
Behind That Curtain 5.9 h The Black Camel length not known
Charlie Chan Carries On length not known
Keeper of the Keys length not known
