Question: The Speckled Band is a film adaptation of a story written by which physician-turned-writer?
Context: Red Devils (also known as "The Hunt for blue fox") is a revolutionary adventure story written by the secretary of the Provincial Committee of the Kostroma RCP (B), novelist and screenwriter Paul Blyahin (Pavel Blyakhin) in 1921 and published in 1923–1926.  The book became popular after the film adaptation of the first novel in 1923.  The silent movie "Red Devils" has become one of the most famous and oft-quoted works of the Soviet adventure film. Sir Arthur Ignatius Conan Doyle KStJ, DL (22 May 1859 – 7 July 1930) was a British writer best known for his detective fiction featuring the character Sherlock Holmes.  Originally a physician, in 1887 he published "A Study in Scarlet", the first of four novels about Holmes and Dr. Watson.  In addition, Doyle wrote over fifty short stories featuring the famous detective. Sherlock Holmes and Dr. Watson (Russian: Шерлок Холмс и доктор Ватсон , "Sherlok Kholms i doktor Vatson " ) is a 1979 Soviet film adaptation of Arthur Conan Doyle's novels about Sherlock Holmes.  Directed by Igor Maslennikov it is the first of a 5-part TV film series (divided into 11-episodes) "The Adventures of Sherlock Holmes and Dr. Watson".  The film is divided into two episodes – "The Acquaintance" (Russian: Знакомство , based on "The Adventure of the Speckled Band") and "Bloody Inscription" (Russian: Кровавая надпись , based on "A Study in Scarlet"). The Speckled Band is a 1931 British film directed by Jack Raymond and an adaptation of Arthur Conan Doyle's story "The Adventure of the Speckled Band", which features Sherlock Holmes and Dr. John Watson investigating the fears of a young woman and the suspicious death of her sister. Howard Marion-Crawford (17 January 1914 – 24 November 1969), the grandson of writer F. Marion Crawford, was an English character actor, best known for his portrayal of Dr. Watson in the 1954 television adaptation of Sherlock Holmes.  In 1948, Marion-Crawford had played Holmes in a radio adaptation of "The Adventure of the Speckled Band", making him one of the few actors to portray both Holmes and Watson.  He is also known for his portrayal of Dr. Petrie in a series of low budget Fu Manchu films in the 1960s, and playing Paul Temple in the BBC Radio serialisations. Childhood Friends Aravind and Rishi struggled for film industry fame before Aravind's films with Rishi as hero become.  They made two blockbuster films together.  Then Konda thought of directing a new story written by a new writer and made a job offer to some writers.  He then saw a story written by a new writer on which Aravind's co-director unfortunately dropped some ink on the script.  Aravind found the script very interesting and he along with his friend Rishi planned to go on a road trip to search for inspiration to complete the remaining script of a third film.  During the ride, Aravind and Rishi meet Nirupama, whom they save from goons.  During the journey, Nirupama asked Rishi to over take a 'black car' which was moving ahead of them.  Rishi then drove the car at a great speed and overtook the car but in the mean time, that 'black car' got hit by a truck but Rishi and his friends had not seen the accident, so they moved forward.  Rishi slowly fell in love with Nirupama while they were staying in a cottage.  But soon Aravind also found Nirupama very interesting, and he also started loving her.  Aravind and Rishi then realise that the events that occurred during their journey was very similar to the script that Aravind had read earlier.  The last page that he read from the script prophesized that two friends will fight with each other for a girl and, they had actually fought over Nirupama. "The Adventure of the Speckled Band" is one of the 56 short Sherlock Holmes stories written by Scottish author Sir Arthur Conan Doyle.  It is the eighth of the twelve stories collected in "The Adventures of Sherlock Holmes".  It is one of four Sherlock Holmes stories that can be classified as a locked room mystery.  The story was first published in "Strand Magazine" in February 1892, with illustrations by Sidney Paget.  It was published under the different title "The Spotted Band" in "New York World" in August 1905.  Doyle later revealed that he thought this was his best Holmes story. Daughter of Albion Illegal is a 1914 Russian film directed by Boris Glagolin and based on a story written by Anton Chekhov.  This was the second film adaptation of Chekhov's work.  The film was released ten years after his death; a time Chekhov thought no one would be reading his work anymore.  It is unknown if a copy of the film exists. "The Summer Solstice", also known as "Tatarin" or "Tadtarin", is a short story written by Filipino National Artist for Literature Nick Joaquin.  In addition to being regarded as one of Joaquin's most acclaimed literary works, the tale is considered to be controversial.  The story narrates a ritual performed by women to invoke the gods to grant the blessing of fertility by dancing around a Balete tree that was already a century old.  Joaquin later turned this short story into a play entitled Tatarin: A Witches' Sabbath in Three Acts, on which a film adaptation has been based. The Spider Woman (alternatively titled Sherlock Holmes and the Spider Woman and Spider Woman) is a 1943 mystery film starring Basil Rathbone as Sherlock Holmes and Nigel Bruce as Dr. Watson, the seventh of fourteen such films the pair were involved in.  As with all of the Universal Studios films in the series, the film is set in then-present day as opposed to the Victorian setting of the original stories.  This film incorporates elements from the novel "The Sign of the Four", as well as the short stories "The Final Problem", "The Adventure of the Empty House", "The Adventure of the Devil's Foot" and "The Adventure of the Speckled Band".
Answer: Arthur Conan Doyle