The Sign of the Four (1890), also called The Sign of Four, is the second novel featuring Sherlock Holmes written by Sir Arthur Conan Doyle. Doyle wrote four novels and 56 stories starring the fictional detective.

Latest episodes of the podcast The Sign of the Four

• 01 – The Science of Deduction
• 02 – The Statement of the Case
• 03 – In Quest of a Solution
• 04 – The Story of the Bald-Headed Man
• 05 – The Tragedy of Pondicherry Lodge
• 06 – Sherlock Holmes Gives a Demonstration
• 07 – The Episode of the Barrel
• 08 – The Baker Street Irregulars
• 09 – A Break in the Chain
• 10 – The End of the Islander
• 11 – The Great Agra Treasure
• 12 – The Strange Story of Jonathan Small