THE KILLER REVEALED! Things heat up in Gotham City as Catwoman, Poison Ivy, Harley Quinn, and their reluctant new partner in crime--solving, that is--Black Canary hunt down leads in their serial killer case. Catwoman ropes Batman into some steamy surveillance work, Harley and Ivy pour out the wine as they pore over evidence, and Canary... well, the only thing keeping her sane amidst wedding dress shopping and her too-fancy engagement party is getting her knuckles a little bruised and bloody during suspect interrogations. But as the bodies pile up and Halloween looms large over Gotham, the Sirens realize working together across enemy lines proves harder than your average Justice League team-up. When the killer suddenly turns the sharp point of their knife from the citys most vulnerable women to the Sirens themselves, will the threat unite them at long last? Or tear their alliance apart for good?