John Dickson Carr said this quote
“ It’s all very well to have your eight suspects parading in their endless ring-around-the-rosebush outside the library. That’s fine. But give some sensible reason why they were there. If you must shower the room with bus tickets, provide a reason for that too. In other words, construct your story. Your present problem is not to explain the villainy of the guilty: it’s to explain the stupidity of the innocent. ”