Mark Billingham

In America, they have specialist mystery book stores with whole sections devoted to cat mysteries, golf mysteries, quilting mysteries. It's a hugely broad genre from the darkest noir to tales of a 19th-century vet who solves crimes, thanks to his talking cat.

Even fictional characters sometimes receive unwarranted medical opinions. Doctors have diagnosed Ebenezer Scrooge with OCD, Sherlock Holmes with autism, and Darth Vader with borderline personality disorder.

I remember watching 'Colombo' a lot with my dad. That was one of the first detective shows I remember watching. And I remember my dad turning to me - my dad loves to turn to me and explain why things are funny. He used to do that with 'Seinfeld' all the time. He did it with 'Colombo', too, set the scene.