"How's it going at the office?" Alex asks as she and Kara spar. Kara doesn't have as many late nights now, so she and Alex have been able to spar regularly on Tuesday nights.

"Not too bad today, the new assistant has only cried twice so far," Kara says moving into position.

Alex blocks her and then manages to use Kara's momentum to throw her across the mat.

"Alex, you have to teach me that maneuver," Kara grumbles as she lays on her back.

"It's the same as the other one, but it's defensive. Kara, your main problem is that you are slow to put up your defenses. You always make the first move. Sometimes you have to dance around a little and get the other person to make the first move," Alex points out.

"Are we still talking about fighting?" Kara quips, before springing back to her feet.

"Hey, I know that I play things too close to the vest. But Kara you're the exact opposite, so let's both try to play more to the middle... I will if you will," Alex says holding her fist out for Kara to bump in agreement.

Kara bumps her fist, but then wraps her hand around Alex's, before twisting it up behind her and pinning her to the wall.

"Kara too much, too much, you're going to break my arm!" Alex grimaces in pain.

"Oh my god, I'm so sorry," Kara blurts out releasing the hold, only to have Alex reverse it and shove Kara against the wall.

"I hate you," Kara mumbles into the wall.

"Kara," Cat says stepping into the open doorway. "Amy is crying again, go check on her please."

"Ms Grant, what did you say to Emily this time?" Kara asks standing up and coming around her desk.

"I may have been a tad too sarcastic, but in my defense, she should have thicker skin if she's going to be my assistant," Cat points out.

"Would it kill you to dial the sarcasm back to a seven? And she is tough, she came back on Monday after you fired her twice on Friday," Kara points out.

"Hmm, I suppose that I could try." Cat says cocking her head as she notices the paintings in Kara's office. There's a large landscape over the couch in the alcove. "This is interesting, where did you get it?"

"Uh, I painted it." Kara replies before rushing down the hall to check on Emily.

Returning to her office a few minutes later, she is surprised to find Cat still there. "Are all of these your work?" she asks.

"Yes, but if you think that it's unprofessional to have my own works in the office, I'll take them home," Kara answers nervously.

"Not at all. They are quite good, the technique that you use and the colors and shading are intriguing... Hmm, so this is what is floating about in that head of yours." Cat remarks raking her eyes over Kara.

Shutting the door to her office and stepping in beside Cat, Kara points to the larger piece. "This was the view out of my bedroom window on Krypton," she says softly. "I mostly captured the colors because that's what I miss most about home. On earth, I can only see the Krypton sky at sunrise and sunset," she explains.

Cat freezes, involuntarily she's holding her breath because Kara is so close to her that now she can feel the rise and fall of her breasts lightly against her arm. Slowly Cat pulls herself together before clearing her throat. "I trust that Amy will be at her desk by now," she remarks, subtly moving away from Kara.

"Yes, and try to be a little nicer or she may actually leave if you fire her today," Kara points out.

"Fine," Cat reluctantly agrees as she opens the door to leave, she pauses. "Kara, have Amy order us dinner... we have layouts tonight," Cat reminds her.

"Yes," Kara says looking up, but finding the doorway empty. Ever since they had dinner at Cat's and really talked, Kara can't help but be even more confused about her feelings for Cat Grant. With Emily as a buffer they don't spend as much time together, but now the time they do spend together is more intense. Despite everything Cat's said about the kiss being a momentary lapse, Kara is positive that there is more to it than that, but she's been taking Alex's advice and waiting for Cat to make the next move.

Cat sits at her desk carefully observing her new assistant, it's obvious that Kara is coddling her to get her to put up with all of Cat's idiosyncrasies, especially her proclivity to insult anyone and everyone when she's stressed. Which Cat knows is one of her worse traits and the one that caused her to fine Kara's breaking point. Which actually was the moment Cat knew that she needed to watch herself more closely around the girl. They went for drinks at Noonan's and Cat had one too many martinis and almost fell trying to get off the bar stool, when Kara caught her. Days later, Cat could still remember the feel of being in Kara's arms, she trembles now thinking about it. Groaning inwardly, she reminds herself to focus. It's way more important to mentor this exceptional girl, than to have a sexual liaison with her. Cat Grant refuses to sully Kara Danvers' reputation or reduce her to a footnote as another of Cat's conquests, tempting as it would be to have Supergirl on that list.

"Ms Grant, I just sent your schedule for tomorrow, is there anything else?" Emily asks hesitantly entering the office at the end of the day.

"No, that will be all," Cat replies frowning at the girl's back.

Kara walks in as Emily walks out and flashes her an encouraging smile. "Meet you at Noonan's first thing," Kara reminds her as they pass each other.

"Kara, surely she can handle picking up my latte in the morning without you holding her hand?" Cat asks irritatedly.

"And I thought we agreed that you wouldn't use that tone, Cat" Kara replies, taking full advantage of the new rule that she can use Cat's first name when they are one on one.

"I agreed that I wouldn't use it on Amy," Cat replies, a smile playing across her face.

"Her name is Emily," Kara corrects before stepping around to grab the layouts off the corner of Cat's desk.

"I know what her name is, I just don't care... yet," Cat quips sitting down on her couch.

The two women sit on their opposing couches, relishing the easy banter that's become a staple of their Wednesday night layout sessions.

"Pizzas are here, I'll be right back," Kara says when security messages her.

"Tell security to bring it up," Cat replies.

"Really? All this time, you've made me go down and get the food when security could just bring it up?" Kara asks annoyed.

Cat smirks and shimmies in her seat enjoying Kara's annoyed expression.

"Now look over these, I'm not seeing anything here that I like," Cat says tossing the sheet over for Kara to look at.

Picking it up, Kara looks over it, before getting up and coming over to sit beside Cat, "This one is good," she says pointing to one and looking up at Cat.

Kara can tell that Cat's heart is pounding and her sharp intake of breath when Kara sat down beside her, are both obvious signs of her attraction. And although Kara promised herself that she would not make the first move, she also decided not to make it easy on Cat.

"Oh, I must have missed that one." Cat says leaning forward her breasts almost touching Kara's arm.

Kara freezes and turns her head to look right into Cat's eyes.

Cat bites her lip and begins to lean forward, just inches from kissing Kara again.

"I'm on my way," Kara says sitting back. "There's been an explosion downtown, people are trapped," she explains, locking eyes with Cat for a moment.

"Well," Cat says leaning back, hiding her disappointment, "Up, up and away and all that..." she says waving her hand dismissively.

"I'm sorry," Kara says before rushing out through the bullpen to the roof.

"It was arson or a bomb, either way that was no accident," Alex explains as they review footage of the explosion.

"There's no sign of alien activity, this isn't anything for the DEO to look into," Hank says after patiently listening to Alex's review of Kara's rescue.

"Who would blow up the old civic center when it was already slated for demolition?" Kara asks.

"Someone who wanted to test something before they use it," Vasquez points out.

"How do we find out what his next target is?" Alex asks.

"We don't. We're not equipped for this type of investigation. But the NCPD will comb through the debris and find the clues that they need to identify him and hopefully they'll figure it out before he strikes again," Vasquez answers.

"That's not acceptable, I'm going out on patrol, I'm going to find this guy and stop him," Kara says stalking off.

The next few days are tense at work. Cat is now being nice to Emily and snapping at Kara, which Kara knows is only because Cat is hurt that Kara didn't come back that night after the explosion.

"The police don't seem to know anything about this bomber," Cat says entering Kara's office and closing the door. "I'm going to go out on a limb and say that you're either avoiding me... again... or you're working on it."

"I'm not avoiding you, but I am giving you space. We can't have you experiencing another lapse of judgement," Kara retorts sarcastically.

"Hmm, sarcasm as stress relief," Cat notes not reacting to the provocation. "Just promise me that you're being careful, I know that you are somewhat invincible, but let's not push that to find out how much," she replies before slipping back out the door.

Kara sighs. She is stressed. Two days have passed and no one knows who or what this bomber's next target will be. Kara's reached out to the local task force to offer her assistance, but they found nothing in the debris to indicate what caused the explosion except a strange residue that they've been unable to identify.

"The residue is from a chemical agent called 27-QRX, it's from the 40's. It was developed in a government lab in the 1940's, highly unstable and as far as I know it doesn't exist in chemical form," Maxwell Lord explains to the task force.

"How do we track down whoever is using it?" Joe Morris, the Chief of Police asks.

"Chief Morris, I have my best team on it and they're working around the clock. But this is a highly dangerous substance," Max reiterates. "I'm putting my people at risk just working on this," he adds.

"Just keep us posted Mr Lord, thanks for your help," Morris says shaking his hand and leaving the room.

Supergirl waits for everyone to leave the room before approaching Lord.

"Are there any markers that I can look for while I am patrolling the city?" she asks him.

"Whoever this is, has to be in an isolated area. He'd be insane to be handling an unstable chemical like this in a populated area," Max replies.

"Cat, I'm heading out now, I just met with Maxwell Lord and he gave me some ideas on how to find this guy," Kara explains sitting down beside her on the patio.

"Maxwell Lord is involved?" Cat questions worriedly.

"The NCPD used his lab to help identify a residue from the bomb site, it's an old chemical agent from the 1940's, but I can't tell you any more than that, so please don't ask," Kara says looking away from her.

"Max only helps people when there is something in it for him, just remember that," Cat says sharply. "And beneath that somewhat charming exterior lies a man is used to getting what he wants. And he's not afraid to take it if necessary"

Out on patrol that night, Kara finds a suspicious property well off the grid. She notices several wind turbines which seem to be the only source of power to the property as it's 25 miles from the nearest road. And the land is pocked with depressions that mostly are a result of concussive force. Scanning the property she sees nobody around so she lands and begins to check it out. Pulling her cell phone out of her boot to call Alex, she realizes that she has no signal. A few minutes later she hears a loud groan of metal moving and then she hears the heartbeat, there's someone here after all.

"What are you doing on my property?" The man bellows from the entrance to an underground bunker, then realizing that it's Supergirl, he rushes back down and managing to close the door behind him and secure it.

Kara rushes over to it and is about to wrench it open, when she remembers Maxwell Lord saying how unstable the chemical is. So instead she takes off for the city and calls Alex. "Look, I think I found this guy, but he's out in the middle of nowhere in a lead lined bunker," Kara explains giving her the rough coordinates for the property.

"We're shifting the satellites now so we can get a look at it," Alex replies leaning over to relay the coordinates to Vasquez.

"Okay, I'm coming in so we can put a plan together. See you soon," Kara says ending the call.

"The property belongs to Roger Lincoln, his grandfather was the chemist Rory Lincoln and he developed 27-QRX in the 1940's to fight the Nazis," Alex explains when Kara returns to the DEO.

"The guy I saw was maybe in his 50's," Kara remarks.

"Okay, so that fits. Roger Lincoln was born in the 60's," Alex notes. "But here's where it gets weird. Roger Lincoln was killed in an explosion twenty years ago. It seems that he found his grandfather's notes and decided to tinker with the chemical components to try to stabilize it and redeem his grandfather's name. But he blew up the lab he was using and although his body was never found, it was assumed that he was killed in the explosion."

"Any clue as to what he's planning?" Kara asks.

"Recently a prominent lab in National City filed a new patent request for a compound quite similar to 27-QRX, naming it 28-QRZ," Vasquez replies.

"Maxwell Lord," Kara says throwing her hands up. "Why am I not surprised? No wonder he volunteered his services to help the NCPD investigate the bombing and was able to identify the bomb residue so quickly," she adds.

"He's probably the target then," Vasquez remarks.

"That's just great because his lab is full of both compounds, if it blows up it will take most of National City with it," Kara points out.

"We need to let Lord know, he's a target," Alex replies turning back around to find Kara gone.

"I hate it when she does that," Vasquez remarks.