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| Publisher |
Titan |
| Variant Cover Artist |
Piotr Kowalski |
| Published | August 2017 |
Someone is causing trouble for Sherlock Holmes and John Watson – and innocent victims are caught in the middle… A mysterious villain is setting a series of deadly puzzles for the crime-solving duo, and failure to solve each riddle is deadly… who is the villain and what is his link to Sherlock and John?
