| Author: | Doyle, Arthur Conan, 1859-1930 |
| Subject: | PR, Detective and mystery stories, Private investigators -- England -- Fiction, Holmes, Sherlock (Fictitious character) -- Fiction |
| Format: | Sound |
| Date issued: | 2007 |
| Language: | English |
| Publisher: | Project Gutenberg, |
| Rights: | Public domain in the USA. |
| Download link: | The Sign of the Four [electronic resource] / Arthur Conan Doyle |