The joker tried to kill Harley, again! That's the last straw for this girl after this she is not coming back. She moves in with poison ivy and well you can read the rest yourself.

Harleen Quinzel isn't like any other doctor you know. She is insane. Don't be fooled by her beauty. In one second, she can shoot your brains out. But only one man could bring that out of her, the Joker. (PG-13)