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The Adventure of the Engineer’s Thumb exemplifies Conan Doyle’s mastery of suspense. Its tight plot—blending a工程师’s trauma with a counterfeiting ring—showcases Holmes’ deductive precision (e.g., decoding the “12-mile drive” riddle). The unresolved villains’ escape adds grit, avoiding trite justice tropes. A compact study of tension, logic, and moral ambiguity in detective fiction.