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Three Investigators

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Robert Arthur Jr.
American mystery and speculative fiction writer (1909–1969)
The Three Investigators
novel series by Robert Arthur Jr.
The Secret of Terror Castle
novel by Robert Arthur, Jr.
The Mystery of the Stuttering Parrot
novel by Robert Arthur, Jr.
The Mystery of the Silver Spider
novel by Robert Arthur, Jr.
The Mystery of the Whispering Mummy
1965 novel by Robert Arthur Jr.