# The Sign of the Four

By Arthur Conan Doyle.

"The Sign of the Four" by Arthur Conan Doyle is a detective novel published in 1890. When Mary Morstan seeks Sherlock Holmes's help regarding her missing father and mysterious annual gifts of pearls, the investigation leads to a buried treasure, a vengeful one-legged man, and murder. Holmes and Watson must pursue suspects through London, unraveling a decades-old conspiracy that stretches from India's colonial past to the Thames. The case tests both Holmes's deductive powers and Watson's loyalty to their intriguing client. (Summary by Project Gutenberg, written by machine.)

- Language: English
- Subjects: Holmes, Sherlock (Fictitious character) -- Fiction; Private investigators -- England -- Fiction; Detective and mystery stories

[Read it](https://invisiblenetwork.ai/books/gutenberg/2097/read)
[Plain text](https://invisiblenetwork.ai/api/books/gutenberg/2097/text)

## Audiobooks of it

- [Sign of the Four](https://invisiblenetwork.ai/books/librivox/966) by Sir Arthur Conan Doyle (4 h 17 min, English)
- [Sign of The Four (version 3)](https://invisiblenetwork.ai/books/librivox/9425) by Sir Arthur Conan Doyle (4 h 28 min, English)
- [Sign of the Four (version 2 dramatic reading)](https://invisiblenetwork.ai/books/librivox/7120) by Sir Arthur Conan Doyle (4 h 5 min, English)
- [Sign of the Four (version 4)](https://invisiblenetwork.ai/books/librivox/8754) by Sir Arthur Conan Doyle (4 h 19 min, English)
- [Sign of the Four (Version 5)](https://invisiblenetwork.ai/books/librivox/18225) by Sir Arthur Conan Doyle (3 h 50 min, English)

From Project Gutenberg. Public domain in the United States.