Sherlock Holmes solves two baffling mysteries.
The Man with the Twisted Lip and The Adventure of the Devil's Foot
This book might be part of the Penguin 60s series.

Arthur Conan Doyle: The Man with the Twisted Lip and The Adventure of the Devil's Foot (Paperback, 1995, Penguin Books)
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Paperback, 90 pages
English language
Published Feb. 8, 1995 by Penguin Books.