If you are a Batman fan or Arkham fan and you are willing to find out more about the Arkham City Characters, then this is the story that you looking for. Based on characters on Arkham City only, but appears in other stories.

it's been two years since jason was killed by the joker and things had gone back to normal. sort of... batman bring in joker to arkham asylum and felt something was off, only to be part of something big, scary and dangerous