Sir Arthur Conan Doyle was a revered author and physician, but he was an ardent proponent of spiritualism during his lifetime. (Credit: The British Library) Back in August, it seemed that Sir Arthur Conan Doyle, the creator of Sherlock Holmes, was cleared of playing any role in one of the greatest hoaxes in scientific history. But in true Sherlockian form, there may still be a twist in this case that appears to be closed. And it's a fitting discussion on Halloween. The infamous ‘Piltdown Man’ hoax culminated in 1912 after esteemed geologist Sir Arthur Smith Woodward and amateur archaeologist Charles Dawson announced they had discovered the ‘missing link’ between ape and man. It featured a human-sized skull with an ape-like jaw, and it fooled scientists for 40 years before it was debunked. So how did Conan Doyle get involved in this, and why should he still remain on the suspect list, despite the latest evidence? Stay with me as I dig deeper into this longstanding controversy.