The Great Detective Sherlock Holmes has proved irresistible to many film makers. There have been many adaptations of the stories and many interpreters of Holmes himself. See how many of them you are familiar with -- it's not quite elementary.
Here is a quiz about some very good movies that not everyone has heard about. Some are American, some are foreign and some of them are old... give it a shot and see how far off the beaten path you've wandered!