This was a bit of a mediocre ending for what could have been an epic conclusion, but such is life. At least we received a conclusion to this series, no matter how obscure or ridiculous it was 🙄.
The main premise of this arc is that Harley Quinn is not herself and is in a state of intense mourning for the death of her close friend Mason. Harley attempts to rid herself of all responsibilities in Coney Island, including her Gang of Harleys and countless tenants, by moving out to Manhattan as a Rent-a-Harley to take down grand major player villains. This goes as expected, which is pretty terrible, but that all changes once Gotham Batman level villain begins to take over Coney Island as they were invited by Penguin as a part of his Coney Island Casino initiative.
What follows is Penguin does what he always does but with a whole lot less class, which is to take over all of Coney Island by inviting all of the Coney Island Mob heads/leaders top men and killing them all via Giant Penguin attack (yes, it is that ridiculous 🙄). What follows is a major scramble as the Gang of Harley tries to manage the mess that the Gotham villains, including Mister Freeze, Mad Hatter, Killer Croc, Condiment King, Bizarro Batman...etc are causing. Meanwhile, Red Tool who has been keeping tabs on Harley takes note of this and before long some of this news hits Harley over the head as Spoondale tries to manage the threats from a cop perspective this causing Harley to go a daily rampage to deal with the overflow which eventually leads its way back to Coney Island.
Harley eventually goes back to Coney Island and makes a deal with Ventriloquist/Scar-Face, who has to take over the gang of Mobsters. What follows is an epic-ish battle against Penguin and his few remaining followers post a heart-to-heart talk between Harley and her friends. Penguin is taken down, and Coney Island is restored....hooray.
There is also this whole side plot involving Harley having been drugged by Penguin's underling Hugo Strange by impersonating her friend Frank Frank who convinces her to leave Coney Island for Manhattan in the first place then attempts to claim full mind control over Quinn but is thwarted by Red Tool. Also, Coach gets word of this via a deep investigation and takes action, which results in her getting kidnapped and imprisoned with the real Frank Frank, but both are freed in the end.
We also have two seemingly unrelated side plots involving Harley Quinn being turned into a Man-Bat creature along with her pal Tony, who goes missing (it's a whole thing) and a Mad-Max dystopia future state destroyed Coney Island/NYC concluding story.
Overall, this wasn't really a bad concluding volume, but it does drag out longer than it should have, and the whole truth serum/drug thing was wacky, along with the whole depressing underlying tone and lack of a cohesive plot. I don't know; this series has moments of intense joy or greatness, then it just kinda falls on its face at the end. I have come to enjoy the wackiness and crazy antics of Harley Quinn over the years, but this series did not do her justice. Here's hoping the latest Dawn of DC arc is better 🤞. 6.5/10 🌟.