Robert Arthur books in order
19 books in the catalogue, about 75 hours of reading in all; the shortest takes 3 hours and the longest 13 hours.
19 standalone books in the catalogue.
Standalone books
Ghost Stories 5.5 h 
Ghosts And More Ghosts 3.9 h 
The Mystery of the Stuttering Parrot 3.1 h 
The Secret of Terror Castle 3.0 h 
The Mystery of the Green Ghost 3.2 h 
The Mystery of the Whispering Mummy 2.9 h 
The Mystery of the Vanishing Treasure 2.8 h 
The Secret of Skeleton Island 2.9 h 
The Mystery of the Fiery Eye 2.7 h 
The Mystery of the Silver Spider 2.7 h 
The Mystery of the Moaning Cave 2.9 h 
The Mystery of the Screaming Clock 3.3 h 
Thrillers and More Thrillers 3.8 h 
The Mystery of the Talking Skull 3.0 h 
The Secret of the Crooked Cat 3.1 h 
The Mystery of the Flaming Footprints 2.9 h 
The Golden Years of Science Fiction 13.3 h 
The Three Investigators 3.0 h 
Tales of Horror and Mystery 6.9 h