(This can apply to book, movie, tv show, etc..)
Mysteries have always been one of my favorite types of stories. I always enjoy a good whodunit or, the not as common but still good howdunit (We know it is, but they usually have a good alibi.)
My personal favorites are the tv shows Monk and Psych, and the anime/magna Detective Conan/Case Closed (Which I already made a topic about.)
So, what about you guys?