Guys... I don't want to do this, I really don't... So get ready for an ultra quick, snark filled spoiler write up.
So Selina is riding around in a huge cat-bike in the open, with no disguise or anything, because that's a good idea, right? She meets up with Gwen, and they crash a party, to steal something, or you know, what ever. Once confronted, they jump out a window at the end of one page, then walk out the front door of the building on the next page.
You can't see it, but I'm face-palming pretty hard on my end.
So Selina visits the kid Joker kidnapped last issue and gives him a teddy bear, that's nice.
So then Selina meets up with some contact we've never seen before, or who knows, maybe we have, I can't tell, not like he's well established either way, but apparently established enough for them to make out or whatever. Regardless, she gets a job from him, which I'm pretty sure is Gwen's job, but you know, who cares? Time to go get the Black Diamond from ARGUS in DC!
So Selina forges some stuff, and she's hired at ARGUS, and meets some scientist outside the Black Room, who you may be familiar with if you follow Justice League. All the good stuff is hidden behind a magically sealed wall, which the scientist explains, while Selina uses some mystic key given to her by her make out partner. When the scientist is done talking, Selina's gotten into her Catwoman gear and he's all "WHOA!" But instead of you know, alerting security, he just goes the fuck along with hanging out with a known thief in a room full of the world's most dangerous mystical artifacts, BECAUSE THAT MAKES SENSE.
So they get into the room, while the dumb as shit security guards decided to open fire on the safe that contains the Black Diamond, because it's reacting to the key Selina brought. Apparently, this highly advanced military institution has ordered its guards just to light up anything that acts funny... BECAUSE THAT MAKES SENSE.
So, all the sudden, the narration shifts to the Scientist, because we care who he is, this of course, after he helps Selina figure out a proper weapon to use inside. For a scientist, this guy is pretty stupid, seeing how he asks "WHY IS SHE ATTACKING THE GUARDS" after letting her know all the different types of weapons.
Then she opens the safe or something, and the Black Diamond starts to effect her... whatever.