The Mystery of the Moaning Cave

Author: William Arden
Cover Illustration: Harry Kane
Internal Illustrations: Harry Kane

Synopsis:
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.

Tidbit: Harry Kane drew the cover illustration of this book that looks somewhat similar to Skeleton Island but from a different angle.

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Internal Illustrations from "The Mystery of the Moaning Cave" as drawn by Harry Kane in the U.S. version of the story
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Internal Illustrations from "The Mystery of the Moaning Cave" as drawn by Roger Hall* in the U.K. version of the story
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*Thanks to Ian Regan for supplying the Roger Hall images