There is a very simple statement to be made about all these stories: they do not really come off intellectually as problems, and they do not come off artistically as fiction. They are too contrived, and too little aware of what goes on in the world. They try to be honest, but honesty is an art. The poor writer is dishonest without knowing it, and the fairly good one can be dishonest because he doesn't know what to be honest about. He thinks a complicated murder scheme which baffled the lazy reader, who won't be bothered itemizing the details, will also baffle the police, whose business is with details.