As Lena's new secretary opens the door to Lena's office, Kara feels nervous. She hasn't seen Lena since the last game night three weeks ago. Apart from a few short text messages—"Miss you too. Swamped with work. Xx"; "I wish I could! Really have to finish this project first though. Rain check?"—Kara hasn't heard from her. Kara knows that the best chance of grabbing a few moments with Lena in one of her work-obsessed weeks is to drop by her office unannounced. So when an interview with a local councilman had ended early, Kara had made her way over to the L Corp building through a dreary and overcast National City.

In and of itself, the radio silence wouldn't have caused these kinds of nerves Kara was now feeling. Both she and Lena could get lost in their work and weeks could go by with little to no contact. It was nothing out of the ordinary. But now there was also that look on Lena's secretary's face.

When Kara had first walked into the area outside Lena's office, the secretary had seemed unusually happy to see her.

"Is Ms Luthor in?", Kara had asked.

"Yes! Yes, she is!" came the enthusiastic response.

Kara had frowned, wondering what was behind this overly effusive welcome.

"Could I …" Kara had started, but before she had managed to finish her sentence, the secretary had jumped up out of her chair. She had waddled over to Lena's door as quickly as her tight tube skirt had allowed.

"You go straight in," she had said in a conspiratorial voice. The secretary had knocked twice. When after a few seconds it was clear no answer was forthcoming, she had opened the door. The look on the young woman's face as she did so Kara had found difficult to interpret. Was it gratitude? Relief? Hope?

So Kara feels nervous standing there in the doorway. What on earth is going on?

Slowly she takes a few steps into Lena's office. The lights are off. Even though it is the middle of the afternoon, little daylight manages to make its way into Lena's office. It takes Kara's eyes a few seconds to adjust to the relative darkness. Kara looks at Lena's couch. There's no one there. Then she hears a voice from behind Lena's desk.

"I told you I didn't want to be disturbed." The voice sounds tired and annoyed.

Kara glances over. She sees her friend sitting in her chair. She's facing the window, her back to the office, a glass of whiskey in her hand.

Kara takes a step closer.

"Lena", she says quietly.

Expecting Lena to turn around and greet her, Kara is surprised when Lena remains immobile and silent.

Kara walks over to Lena's desk.

"Lena?"

Still nothing.

Kara walks around the desk in order to be able to cast a glance at Lena's face.

Lena looks like she hasn't slept in days. She's always been pale, but now her skin looks almost translucent. Her eyes are red. Has she been crying?

"Lena, what's wrong?" Kara asks.

Kara is reminded of the time she arrived at Sam's house finding Lena drunk and despondent. She had been slumped over the counter, slurring her words. That was bad, but now she seems worse.

For a moment, Lena slowly turns her head in Kara's direction. She hardly seems to register Kara is there. Then she moves her head back and continues to gaze out of the window.

Kara kneels down in front of Lena. She puts both her hands on Lena's knees. The physical contact seems to pull Lena back into the here and now. She gives Kara a sad and empty look.

"Talk to me," Kara urges her, leaving her hands on Lena's knees.

Lena is quiet for a long time. Then she looks down at Kara and says wistfully, her voice breaking a few times, "I killed Lex. I killed my own brother. I killed him because I wanted to make the world a safer place. For everyone. For the people I care about. Cared about."

"Oh Lena. Lex died on Shelley Island when he let go of Supergirl's hand. It was all over the news."

Lena slowly shakes her head. She takes her eyes off Kara and stares out the window again.

"He teleported himself to a hide-out where I put a bullet in his chest," Lena says, her tone biting and cold.

Suddenly Lena gets up. She almost knocks Kara to the floor. Kara lets go of Lena's knees and slowly rises. Lena puts her whiskey on the table and walks onto the balcony.

Kara has a hard time wrapping her head around what Lena has just told her. Expecting to feel shock at what Lena has done, perhaps even disapproval, Kara surprises herself when all she feels is sadness. Kara turns her head and looks at Lena.

Her heart breaks for her friend. To carry around that kind of burden? Kara can't even imagine what these past few weeks must have been like for Lena. Why hadn't she reached out? Why hadn't she let Kara be there for her? They had come so far. With an aching heart, Kara slowly follows Lena onto the balcony.

Lena has moved to the edge of the balcony and is peering down at the city far below. Feeling some trepidation, Kara nevertheless moves closer to Lena and puts a hand on her friend's arm, stroking it gently. "I'm so sorry, Lena," she says. Lena looks at her.

"What can I do?" Kara asks. "You want me to stay with you for a bit? You want to come stay with me? What do you need? Just let me know." Lena gives her a dark look. It sends a shiver down Kara's spine.

"Please, Lena. You can trust me."

As she utters these last words, Kara knows she's somehow made a terrible mistake. Lena's dark look turns into one of fiery hatred. Kara feels herself physically recoil. She takes a step back.

"I can trust you?" Lena snipes.

"Yes, of course you can," Kara says pleadingly.

Lena's next move is so out of character and so unexpected that when Kara finally realizes what's happening, it's already too late.

Lena utters what sounds like something between a chuckle and a groan and flings herself off the balcony. "Lena!" Kara cries out. In the blink of an eye, Kara has changed into her Supergirl suit and is flying after Lena.

Halfway down the tower, she catches up with her falling friend. She puts one arm under Lena's knees and the other behind her back, just as she had the last time she caught Lena on her way down this very same building. The women hang suspended in the air.

Just as Kara tries to think of an excuse to justify how Supergirl managed to get there so quickly, she feels Lena's eyes on her.

The dark look from earlier is still there.

"See, I do trust you," Lena says sarcastically.

Kara feels as if the world slowly recedes from beneath her.

Oh God. She knows.