Come to think of it, I'm not sure why I included A Dark Victory. Is Catwoman even in that one? Maybe not. Maybe I just assumed she is, since Loeb likes putting everyone in every book. But Long Halloween and Hush for sure.
Heart of Hush is all right too. It doesn't stand out compared to some of the others, but it's another pretty important book when it comes to the Batman/Catwoman relationship.