Jane screeched at this further betrayal and went for Henry. They began to struggle. Henry was the stronger out of the two yet the woman's pain was unstoppable. His hands wrapped around her throat and Jane clawed at his face until she fell. She lay there, across the tracks, and was quite still. Mrs. Cavell gasped in shock and Henry ran past us back to the train. We stared down at Jane's body.

Forth in a string of new stories set in the late 19th Century, no fictional character is more renowned for his powers of thought and observation than Sherlock Holmes.