Source: comicsauthority.com
4.The Long Halloween
Of the whole list I’ve put together, this is the one you’re most likely to have already read. But it’s still really good so I’m putting it on anyway.
The Long Halloween is a thirteen-part story taking place across one year. Over this year, a string of mysterious mob killings begin, taking Batman, Commissioner Gordon, and District Attorney Harvey Dent on a disturbing path that will leave the three of them changed, one irrevocably so. As the year progresses, with a killing on each major holiday, Batman must face many of his greatest foes in a gauntlet with a mystery at the center.
Oh, and if it seems familiar to you when reading it, that’s because a little movie called The Dark Knight heavily borrowed from it for its version of Harvey Dent.
It’s one of my favorite Batman mystery stories, and although its easily the best known book on this list, it’s one you should definitely own.

