So, as where we left off, Joker is choking Harley at ACE Chemicals, until the point where she passes out. Upon her coming too, she soon finds her self at the edge of another acid bath, as Joker is going to give a refreshing dip of sorts. Meanwhile, Amanda Waller and Yo-Yo are watching it all unfold through a secret lens Waller had planted on Harley's eye. Waller is showing it all to Yo-Yo to gain his trust, so he can spy on the squad, and in return, she'll teach him to gain respect.
The short end of the rest of the story goes... Harley breaks free of the planned dip, only to find her hyenas have been given rabies, because like him, Joker has freed them... or something. Harley and Joker start fighting after she kills her hyenas which ends up in Joker biting off part of Harley's ear, poisoning her. Harley pretends to give in, and ends up biting Joker's tongue when they kiss. Joker kicks her, and she finally passes out.
Here's the kicker. Joker is bored of Harley, claiming she's lost her way and will never be his Harley, so instead of just killing her or sending her back to prison, he leaves her chained up to die with the others. Yes, there's a room of skeletons of other Harley's who have failed Joker over the years. Like Batman had multiple Robins, Joker had multiple Harley side kicks... I count eight full bodies.
Moving on... Joker leaves to do the stuff in Batman #14, comes back and Harley isn't there. Hours later at Belle Reeve, Harley shows up on the doorstep, having broken her wrists and wiggled free... then Deadshot wakes up, just cus.