The Mystery of the Moaning Cave

Case 10
Many years ago, the young bandit El Diablo disappeared into a cave, never to be seen again. Now an eerie moaning sound is coming from his old hideout, and the ranchers who live nearby think he may still be alive. The Three Investigators set out to explore the moaning cave--and soon wish they had come armed with more than a flashlight !


The boys travel to a ranch to investigate a cave that has unexplainably begun moaning and discover that the moaning is related to a diamond robbery and a long-dead bandit named El Diablo.
german book -->
 
Jupiter Jones First Investigator (Justus Jonas)  
Pete Crenshaw Second Investigator (Peter Shaw)
Bob Andrews Records and Research
Konrad Schmid helper at the Salvage Yard (Kenneth O'Ryan)
Mr. Jess one of the operators of the Mendoza-Ranch; expert in hunting and tracking
Mrs. Martha Dalton one of the operators of the Mendoza-Ranch
Prof. Walsh historian
Mr. Luke Hardin foreman at the Mendoza-Ranch
Mr. Ben Jackson argonout and prospector
Mr. Waldo Turner friend of Ben Jackson
Mr. Cartigo worker at the Mendoza-Ranch
Commander Paul Crane navy diver
Mr. Sam Reston detective for an insurance company
El Diabolo right name: Gaspar Ortega Jesus del Delgado y Cabrillo


[(white in brackets) = german name]
Story by: Robert Arthur,
Cover Illustration: Harry Kane,
© Random House Trade 1968
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