A late-night job offer. A mysterious employer. A horrifying escape.

Victor Hatherley, a young hydraulic engineer, receives an unusual request—to inspect a machine at a secluded country house in the middle of the night. The offer is lucrative but strange, and despite his misgivings, he accepts. Upon arrival, he meets the enigmatic Colonel Lysander Stark and his associates, whose behavior only deepens the mystery. But before long, Hatherley realizes he has walked into a deadly trap.

Narrowly escaping with his life—but at a terrible cost—he turns to Sherlock Holmes and Dr. Watson for help. As Holmes pieces together the clues, he uncovers a sinister criminal operation and a ruthless conspiracy. But will justice be served, or will the villains slip through Holmes' grasp?

Filled with suspense, mystery, and a chilling atmosphere, The Adventure of the Engineer's Thumb is one of Arthur Conan Doyle's most gripping Sherlock Holmes tales.