Simply put, a mystery writer who solves actual crimes. After all, who better to unravel all the twists and turns of a mystery than someone who creates them for a living? Possibly a result of Write What You Know.
- The leads from Kamen Tantei kind of subvert this. Yes, they're mystery writers who investigate mysteries. But the female lead, especially, is a "fairplay" mystery writer living in a world where ghosts, psychic powers, "all a dream" endings and fictional characters come to life (including the title character) make it impossible to use logic and common sense to actually solve mysteries.
- Detective Conan: The protagonist's father, Yusaku Kudo, is a mystery writer who occasionally steps in to solve mysteries when his son is stumped.
- Ellery Queen, whose adventures were further publicized by his two creators using the byline "Ellery Queen", is at least the Trope Codifier.
- Ariadne Oliver, a self-insert parody of Agatha Christie, is a mystery crime writer who occasionally gets involved with real murders. Deconstructed in that she admits that her writing doesn't prepare her well for the real thing, since she's so used to "stacking the deck."
- Harriet Vane from the Lord Peter Wimsey novels is another example.
- A case could be made for Dr. Watson, as he writes stories about the crimes he helps solve.
- In Chris Ewan's The Good Thiefs Guide series, Charlie Howard is a thief who solves murders who has written several mystery novels about Faulks, a thief who solves murders.
- In Carter Dickson's Sir Henry Merrivale novel And So To Murder, William Cartwright is a detective novelist hired to work for a film studio, only to find some unknown person is trying to use his plots as actual murder methods.
- In the Michael Slade novel Ripper, a whole bunch of mystery writers gather for a Mystery Dinner event on an isolated island, and end up hunting - and being hunted by - a killer in their midst.
- Jessica Fletcher from Murder, She Wrote is the classic example.
- Castle has the famous mystery novelist Richard Castle who work with Detective Kate Beckett (Katic) of the NYPD using his knowledge of criminal methodology to solve real crimes.
- The Snoop Sisters aired monthly as part of the Wheel Program NBC Wednesday Mystery Movie. In it, A spinster and her widowed sister, who are both mystery writers solved crimes.
- Temperance Brennan, from Bones. She writes mystery novels, and she also helps solve crime. Although her career as a forensic anthropologist is probably more important to her ability to solve crimes than her alleged skill as a writer.
- McGee on NCIS is a special agent, who wrote a best selling novel... which he would have preferred his coworkers never knew existed. Once they know, however, it becomes useful; in one episode, he is able to use his fame to get into a club as part of an investigation, something the other agents wouldn't have been able to accomplish. He continues to write additional novels, one of which forms a plot in a different episode where one of his readers takes things a bit too seriously.
- Maxwell Beckett (Edward Woodward) in Over My Dead Body
- In the German TV series Graf Yoster Gibt sich die Ehre, the titular British Count Yoster is a well-known mystery writer. He also moonlights as an amateur detective, helped by his chauffeur and bodyguard Johann (a former petty criminal) and sometimes his niece Charlie.
- The Ellery Queen novels were adapted into a television series.
- Paul Temple from Send For Paul Temple, plus its various spin-off films, television series, novels and comic strips.
- BBC Radio show Foul Play pitted three mystery writers to guess who's the murderer in the short skit they presented.
- Parodied in Old Harry's Game, when Satan summons the spirits of Arthur Conan Doyle and Agatha Christie to solve Edith's murder, but they turn out to be completely useless. Dame Agatha suggests her own plots, regardless of their relevance, and Sir Arthur keeps going on about ghosts and fairies.
Agatha: I'm sorry, but I'm doing my best here. Usually I know who the killer is before I start out.
- AkaSeka: Edogawa Ranpo is basically this trope personified. Not only is he a mystery writer who solves crimes, he is also obsessed with solving them, to the point where he actively seeks out cases to solve, acts like a little kid being given candy when asked to investigate crimes, and whines when no mysteries are taking place.
- Reggie becomes this due to the number of murders he helps solve in Where the Bears Are.
- A Real Life partial example might be Sir Arthur Conan Doyle. From The Other Wiki: "Conan Doyle was also a fervent advocate of justice and personally investigated two closed cases, which led to two men being exonerated of the crimes of which they were accused." See here.
- Granted, Conan Doyle had actual forensic training, and he had been a detective and lecturer himself before writing the Sherlock Holmes stories.