I read and watch detective stories a lot. I think it is because they are essentially puzzles to be solved and I am a puzzle solver at heart. I enjoy all kinds of puzzles. A ‘puzzle’ for me is any problem for which I think there should be a solution that lies within my grasp and ability. This is also the likely reason I was drawn to science because much of that also involves puzzle solving. In my spare time I do cryptic crosswords and I also play the card game bridge where each hand is essentially a puzzle where a task is set and you have to figure out the best way to reach it.
Over time, I have found that I have clear preferences as to the kind of detective story. They should be lean and spare, where the focus is almost exclusively on how the solution to how the crime was committed is worked out. I prefer that any violence be avoided, or if there is any, for it to take place off-stage with as little graphic detail as necessary. There does does not even need to be a murder. In some Sherlock Holmes stories, not only is there no murder, there is not even a crime but just a mystery to be solved.