The Saga Continues
The nice thing about trade paperbacks is that they sometimes include issues from other books if they're relevant to the current plot. That was the case in this second volume of Gotham City Sirens. It includes Catwoman 83 which continues the story of Catwoman's sister. This comes into play in the last couple books collected in GCS. And so that was a nice addition to the collection.
This volume has a lot more of the girls settling in to living together so there is quite a bit more fan service. I'd say that most of it isn't gratuitous so I didn't find it bothersome. We also get another Riddler issue. Apparently something happened to him in another book because he seems a bit off balance and ready to tip into the side of returning to crime. He makes mention here and there of another incident, but I imagine the details are in Detective Comics. Batman and Robin were essentially absent.
The book continues to develop these characters and I hope it's not for nothing when the big DC reboot comes. They seem to really be learning a lot, even if some of that is the futility of trying to stay clean.