Kat stood behind her brother, arms crossed and hip popped. He turned around and jumped, seeing her staring up at him. He cleared his throat and straightened up, looking down at her.

"Katherine. Didn't see you there. What are you doing here?" He asked.

"I live here. What are you doing here, Luther?" She shot back tersely.

He was mildly taken aback by her tone, but showed no signs of backing down. "Maybe we should continue this conversation in private?" He suggested in a hushed tone.

"Sure. Follow me." She snapped. She turned on her heel and marched towards her and Diego's room.

Luther followed, nodding awkwardly at those who passed by. As soon as they made it, Kat shut the door and walked over to sit on the bed. Luther stood awkwardly at the bottom of the stairs.

"So I'll ask again, what are you doing here?" Kat finally said.

Luther sighed, looking at her with a small frown. "Investigating, ok? I just wanted to investigate and see where you guys were on the night dad died. I had to be sure." He tried to explain.

Katherine saw red. Who the hell did he think he was, not only accusing her of murder, but Diego as well? She stood up to her full height, fists clenched at her sides.

"What the hell, Luther? Where do you get off accusing your family of murder? You know what? Screw you." She yelled.

"You know what? You're just jealous because I was Number One. I was always the best. I was dad's favorite because I stayed and everyone else left." Luther retorted.

She laughed quietly at her brother's words, shaking her head.

"What about this situation is funny to you, Katherine?" Luther demanded.

"You lived on the moon for FOUR FUCKING YEARS because "daddy said he needed you to". Diego fights crime in spandex like some kind of goddamn vigilante and doesn't talk to me about anything anymore. Allison is so starved for attention that she lets people broadcast her private life for entertainment. Klaus has to stay strung out to even function anymore. Five is a fifty somethingyear old functioning alcoholic who has seen some shit, Ben is dead, Vanya wrote a book about us, and I'm stuck here cleaningup after our family's messes because that's what I do. It's what I've done my whole life. So tell me, Luther, what in God's name makes you think that I would kill our father when all I've ever done is try to keep this family from falling apart?"

Kat had finally snapped, and her sibling stood in silent shock as he processed her words. He took in her appearance, the tears streaming down her face and her fists clenched tightly at her sides. The energy radiating off of her was intense and honestly frightening.

"Kat, I-"

"No Luther! Whatever you have to say, I'm done listening. Stay and wait for Diego or don't, I couldn't care less. Maybe he'll actually communicate with you." She said, walking out of the room and slamming the door behind her.

No one got in the way as she stormed into the ring, ready to fight anyone brave enough, or stupid enough, to attempt.

Half an hour later, Kat had run through the few guys who were willing to fight her and she had resorted to using the punching bag. Hit after hit she released her frustrations out on the piece of equipment.

Diego walked in and was immediately greeted by the gym patrons.

"Hey, Diego." Al said, catching the man's attention.

Diego walked over to the man with a smile on his face. "What can I do for you?"

"You might wanna check on your girl. Your brother came by a while ago and they had some kinda screamin' match. She beat the hell outta a few of the guys, and is gonna break the punching bag soon if she doesn't take a break." Al informed him, hitching a thumb over his shoulder at the woman.

Diego looked over to see Katherine indeed wailing on the bag in front of her. She looked angry and upset- something that made him both worried and nervous.

"Thanks Al." He said before walking over to where Kat was.

"Hey, beautiful." He said, cautiously approaching her.

She continued to throw punch after punch. "I take it Al told you?"

"Yeah. You wanna stop punching that bag like it has my face on it and come talk to me?" He asked, grabbing the bag.

She looked up at him, breathing heavily as she nodded. "Yeah. Sure." She followed him to the room, stopping short when he paused in front of the door.

He listened for a moment before swinging the door open and throwing a knife.

"Ow! What the-" Luther's voice rang out.

"I could smell it was you." Diego said, rolling his eyes as he and Kat walked in and he closed the door.

"What the hell? You could have killed me."

"If I wanted you dead, you'd be dead."

Luther sighed, seeing the murderous glint in Kat's eyes. "It's a nice place."

"We like it."

"So why didn't you tell me?"

"Tell you what?"

"That you were fighting the night that Dad died, and Kat was in her studio. I checked with the guys out there."

"Well, I shouldn't have to prove my innocence to you or anyone else in this family."

Kat winced at that. He sounded rather defensive.

"Yeah, you're right. But, I just thought that-"

"Yeah. I know what you thought. Now you have a nice day, brother."

Luther looked at the two and sighed before bumbling out of the room.

It was a few minutes before Kat finally broke the silence.

"So you didn't come back last night. I waited up for a while." She said, lloking at the floor.

"Yeah. I just, I went to the crime scene, and Eudora was there and she-"

"It's Eudora again now, huh?"

Diego sighed. "Come on hon, not right now."

"No, exactly right now, Diego! I don't know what the hell goes through your head sometimes, but I'd like to think that you have enough sense to know that if we don't talk right now, I'm gonna lose it. I've sat there and watched you keep secrets from me once, and I won't do that shit again. I won't. So you tell me here and now what you're hiding from me." She demanded.

He looked at her with an even expression and sighed. "I don't know why you want me to explain myself. I've done nothing wrong. I'm not seeing Eudora outside of work. And even then it's rare." He said flatly.

She closed her eyes and took an uneven breath, shaking her head. "I know you're hiding something, Diego. For the love of God just talk to me. Tell me what it is. I hate being kept in the dark."she pleaded.

"Fine. At the pier the other night? I was throwing dad's monocle away. Because I took it from mom." He admitted.

"What do you mean you got it from mom?"

"I guess she took it the night dad died. I didn't say anything because I didn't know how you would react." He said, looking down at her.

"Diego, you know you can tell me anything. You know I just hate being kept in the dark or lied to." She reminded him.

"I know. And about Patch, I'm telling the truth. Nothing is going on with her. Nothing ever will. I love you, and I will never forgive myself for hurting you. You can be damned sure I won't do it again. I'd rather die than be the reason you're hurting." He told her, resting his forehead against hers.

She closed her eyes and exhaled shakily. "You know that I love you. I know I don't say it enough, but I do."

"I know you do baby. And I promise to keep you in the loop on everything from now on."

"Thank you. That's all I wanted. Now I need to go take a shower." She said, kissing him gently. She gathered her clothes and a towel as he watched on from the side. She began ascending the stairs, but stopped halfway, looking down at him. "You just gonna stare at me, or are you gonna come help?" He scrambled to grab his things and followed her to their private shower, laughing as they went.

It was ironic that the girl who spent all of her life healing others needed help to heal herself. And who better to help than the boy who made her world seem a little less dim just by being in it?