Robert Papp books in order
12 books in the catalogue, about 26 hours of reading in all; the shortest takes 2 hours and the longest 2 hours.
12 standalone books in the catalogue.
Standalone books
The Clue in the Corn Maze 2.3 h 
The Mystery of the Orphan Train 2.2 h 
The Creature in Ogopogo Lake 2.4 h 
The Giant Yo Yo Mystery 2.3 h 
The Box That Watch Found 2.2 h 
The Secret of the Mask 2.1 h 
A Horse Named Dragon 2.4 h 
The Ghost at the Drive-In Movie 2.1 h 
The Great Detective Race 2.4 h 
Superstar Watch 1.8 h 
The Spy Game 2.4 h 
The Amazing Mystery Show 2.0 h