Sir Arthur Conan Doyle's this book was a really good one. It's all detective stories and good one too. Though there are a few boring ones, most of the stories are really interesting with a good way of mysteries. I cannot say mystery that cannot be solved, we may be able to guess what's going on. But, he was able to devise these stories brilliantly. Each one is entirely different one from the other. A good read, if you like detective stories.