B&A: Could you please critique this?

Okay, this is part of a story I'm writing at the moment. It's in the middle of the second chapter. Could you give me a little critique on what I could improve, or just a little note to say what you think? I'd appreciate it!

Thanks

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Morning.

Rune woke up early enough to see the beginnings of sunrise through her sky light. She rubbed away the hazy coating of sleep that covered her eyes, yawning as she did so. Her stomach tensed a little as she touched it gently from under a white surgery top. The stitch marks felt bumpy as flesh felt flesh, but there was no real pain. Maybe she panicked too quickly. The after effects of whatever anaesthetic she’d taken had virtually worn off and a calm feeling swept across her.

(i) But still, I just want to know what happened. (i)

She closed her eyes. Being stressed wouldn’t solve anything. The initial shock passed, and all that was left were questions – questions that would never be answered.

“In that case, I’ll have to find out myself.” Rune slipped out of bed and walked slowly, heading towards the large door. She slammed her fists against it three times. Nothing happened. She had a great urge to escape. But that door. That door was blocking her from the world. She spoke in a soft whisper, but was loud enough for the door to hear.

“Why am I always kept in the dark? It’s always been like this. Isolation. Secrets. I can’t take it anymore. I am going to find a way out of here. And when I do, I’ll never come back.” There of course was no reply. The inanimate door didn’t know what it was doing. How could it?

Rune gave a small laugh. A small, timid laugh. But a laugh all the same. She wasn't going to live in fear any more. She was going to be free. There was no question about that. She’d snapped and she wasn't going to let the moment pass. The determined Rune never came around for long.

“But where do I begin?”

That question hit home. She couldn’t merely jump into this mission without a plan. That would be moronic. She knew The Lab wasn't guarded on the inside, but it didn't need to be. Nobody stepped into The Redenal Laboratory; they couldn’t get past the electric fence that circled the perimeter. The task would be impossible unless they were in a possession of a master activation card, and for anyone living outside The Lab, getting one was an inconceivable mission. Even with a standard activation card, when someone was entering The Lab, access had to be granted from the inside by Richard himself.