I'm on a major mystery kick right now. I've always been in love with all the Sherlock Holmes stories, and I recently read The Name of the Rose, and now I'm reading "The Improbable Adventures" and other collections of Sherlock stories by authors other than Doyle.
Are there any good series (or standalones, I'm not picky) of mystery stories with the same kind of character as Sherlock and Friar William as a protagonist? The whole "aloof, overly-intelligent, brusque detective who figures things out sooner than he feeds it to the narrator" style is what I like. Or hell, if there are any mystery stories so good that you MUST recommend them even if they don't fit that requirement, go for it.