The Mystery of the Invisible Dog

Author: M. V. Carey
Cover Illustration: Jack Hearne
Internal Illustrations: Jack Hearne

The boys are contacted to investigate a young man's ability to be in two places at the same time and get involved in the theft of a crystal statue of a Carpathian hound.

Tidbit: Professor Barrister from "Singing Serpent" appears in this story.

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Internal Illustrations from "The Mystery of the Invisible Dog" as drawn by Jack Hearne in the U.S. version of the story
(click on thumbnail for larger image view)