Sherlock Holmes in The Adventure of the Obsidian Key

By RR Thwackhurst

A terrified scholar arrives at 221B Baker Street with tales of murder most foul. Professor Edmund Willis, respected medievalist at the isolated Northgate College, has been found dead in a locked library-his final words a cryptic warning in Latin: venenum and umbra. Poison and shadow. But the authorities see only an elderly academic worked to death. The case is closed. Sherlock Holmes knows better.

Summoned to the desolate Yorkshire moors, Holmes and Watson enter a Gothic fortress that house five centuries of forbidden knowledge. Here, medieval manuscripts conceal deadly secrets, and a mysterious Brotherhood preserves rituals that predate Christianity itself. As Holmes uncovers a murder weapon of terrible sophistication, a second victim falls, and the detective realizes he is not merely hunting a killer, but confronting a conspiracy fifteen centuries in the making.

A tale inherited sin and the terrible price of knowledge, this mystery takes Holmes and Watson into their most atmospheric and morally ambiguous case yet. In the end, they must ask: Is justice served when the guilty take their secrets to the grave?

• Format: Paperback
• Language: English
• ISBN: B0GNKJ1828
• ISBN13: 9798248433957
• Release Date: February 2026
• Publisher: Independently Published
• Length: 60 Pages
• Weight: 0.15 lbs.
• Dimensions: 0.1" x 5.0" x 8.0"