Flash back to Gotham before Arkham City, to the last time Catwoman, Poison Ivy, and Harley Quinn worked together! The Sirens are hot on the case of an animal-killing criminal and everything should be running like clockwork, but once Batman arrives will his presence split the team? Back in present-day Arkham City, the two Sirens in captivity have all the time they need to stew on past betrayals by their former teammate. But how far will they go to get back at her? And how does it involve Joker and Batman? The Sirens' allegiance falls even further into ruin as promises are broken and schemes are thwarted. And with Batman used as a lure, the situation is about to get even more complicated for Catwoman! Who will prevail in this splintered threesome?