The best, and most consistent, volume of this series by far I think. Will Pfeifer runs with his plot from the final arc of the previous volume and takes it onwards and upwards through these 16 issues (and beyond, by the look of things). Even with the One Year Later gap in the middle, this is the very definition of an ongoing story which evolves as it goes along. Even with different arcs identified and some one-shot stories in the middle, there's no placeholder issues, and nothing that doesn't add to the ongoing development of the characters involved.
Slam Bradley, Holly Robinson, Slam's son Sam, Batman, Zatanna, and of course Selina herself go through the wringer in this volume as Catwoman deals with motherhood, vengeful villains, a film-obsessed nutcase, mind-wipes, and Lex Luthor (sometimes all at once, and not necessarily in that order).
Aiding the consistent storyline is the fact that after Pete Woods' opening three issues which are great, David Lopez takes over and pencils every single issue of the rest of the trade, and the series as a whole up until it ends at #82 from what I've seen. That's pretty much unheard of nowadays, and it really helps solidify this as a strong creative team, since everything stays the same creative-wise. And of course, the fact that Lopez is a great artist helps massively. He never skimps on backgrounds, his facial expressions are great, and he never descends into cheesecake poses for Catwoman (unlike some of the Adam Hughes covers which, whilst beautiful, are borderline pr0nface at times).
I hope DC finish this run off and collect issues #66-82, because if this volume is any indication, it'll be a great right through to the end.