a private detective in the detective stories of Arthur Conan Doyle. Holmes is able to solve crimes and mysteries using his powers of observation and deduction (= logical thought), sometimes without leaving his flat/apartment in Baker Street, and often to the amazement of the police and his friend Dr Watson. People often say, ‘Elementary, my dear Watson’, when they think that a problem is easy to solve, although Holmes never actually says this in any of the stories. He is often shown wearing a special type of hat called a deerstalker and smoking a curved pipe. He also plays the violin and sometimes takes drugs. The Sherlock Holmes stories are still very popular and have been filmed many times.
“It is quite a three-pipe problem, and I beg that you won't speak to me for fifty minutes. ”