Conan Doyle Arthur. The Adventure of the Speckled Band

It is one of four Sherlock Holmes stories that can be classified as a locked room mystery. A young woman named Helen Stoner consults the detective Sherlock Holmes about the suspicious death of her sister, Julia who died right before her marriage. Now it is Helen who is engaged, and the strange circumstances repeat themselves.
The file contains the audio track and the text of the story.