Disclaimer: I own nothing.

So, Halloween is coming up and what better way than to celebrate than to torture some of my favorite fictional characters by sticking them in a situation from one of my favorite horror movies? Yes, here I take Penelope Garcia, Emily Prentiss, and Derek Morgan and plop them in the middle of the epidemic from 28 Days Later. It's gonna be fun! Please review!

A/N: For those of you who do not know the setting of 28 Days Later (and you should watch it if you can stomach gory horror!), essentially what occurs is Britain is overcome with a rage virus that makes people go crazy and lose all control so that they start killing people. Now, some call them zombies, but this is not the case. These people, called 'The Infected', are not dead. They do not live off of human flesh. Yeah, they go around sinking their teeth into people, but they don't eat them, they just bite, then go about doing the same to other non-Infected people. That, and they die of starvation. This death is really death. They don't get back up and start eating people. Now that we have established they are not zombies technically, I can continue. So there's a virus that spreads across Britain and it turns into your typical post-apocalyptic society, people fighting to survive on their own as there is no one else to help them.

Penelope woke to the sunlight streaming in through her bedroom window where she was staying while in London at Emily's flat. She was so glad Derek had convinced her to tag along while he was on temporary duty. Since she'd been gone, Penelope had done nothing but miss Prentiss. The trip was also a nice way for her to relax before she met the BAU's replacement for Emily.

Sitting up in bed, she glanced at the clock. It was nine o'clock. Sighing, she rubbed her eyes and put her glasses on her face, the world coming into much greater clarity. She rose from the plush white comforter and sheets and through on a silk robe over her tank top and boy-short covered butt.

When she exited her room, she started for the granite counter topped kitchen and was more than a little delighted to find her best friend sipping a cup of coffee and wearing no shirt.

"Morning there, Hot Stuff," she purred coming in behind him.

He turned around and flashed her his million dollar grin. "I'll show you a good morning, Baby Girl," he said, leaning down to kiss her cheek.

She giggled, the thought If only... going through her head. "Keep teasing me, and I'll have to make good on it," she flirted.

He tweaked her nose. "Silly girl," he laughed deeply. He gestured towards the coffee pot. "There's caffeine for your enjoyment."

She nodded. "Oh, I could definitely use a cup of it," she said eagerly, getting a mug from the cabinet. As she poured herself a cup of coffee, she looked back up at him and tilted her head to the side. "Where's Em? Don't tell me she's still in bed. I know we all got a little tipsy last night, but not that tipsy!"

A grin covered his face. "Although, if we had gotten tipsy, I would have to have my way with you," he purred, getting down towards her face, so close that his breath was on her cheeks. Her lungs quite working and she felt a hot blush creep up her cheeks. Giggling uncomfortably, she backed away and took a sip of her coffee. She wasn't in the mood for his teasing. It would just arouse her too much and then she would have a pleasurable ache rolling through her body all day that only mad sex with him would satisfy. "Well, where did Em go?" she croaked.

He backed up and nodded uncomfortably. Did he look...disappointed? Rubbing the top of his smooth head, he said, "She went out to get some groceries and to drop by her office a moment. She'll be back to do some sight-seeing with us as soon as she's done there."

"Well, then..." she said, tapping her chin. "What are we going to do until she gets back?"

A coy smile covered his face and he went closer to her, grabbing her around the waist and picking her up in his arms. The blush that had covered her cheeks only moments ago was now covering every surface of her body. What the hell was he doing? As he took her towards the couch with a bright smile on his face, she suddenly began to panic. Oh, dear lord, what was he about to do. She didn't look particularly amazing at the moment. She was wearing underpants that had fraying lace because she had yet to buy more. Her body was slightly bloated from being on her period the first few days of being in London and it made it look like she had gained five pounds. She yelped as he carried her towards the couch and plopped her down on the cushions. He smiled down at her utterly confused face and shook his head. The next moment, he was sitting next to her and picking up the remote.

"So," he said with his silly crooked grin that kept her up some nights. "What British show does your sexy little butt want?"

Leaning her head against his shoulder, she giggled. "Turn it to, Downtown Abbey," she requested. "We can watch that until she gets back."

XXXXX

"Prentiss!"

Emily looked up from her desk where she was gathering a few papers to find her boss rushing towards her. She tilted her head to the side. "Hey, Kent," she said. "Is everything okay? You look rather panicked."

He nodded vigorously. "That's because things are really wrong," he said. "We've got a situation happening in the streets right now."

"What's going on?" she asked, suddenly very serious.

He shook his head and pulled out his tablet from his briefcase. "Let me show you this first," he said gravely. "This was taken by a civilian and posted on the web. It's already gone viral." He pressed the play button on his screen and the sounds of screaming erupted. She noticed that people were running in total chaos and at first. A few seconds later, she saw exactly why. Several people in what looked like a mob were screaming manically as they chased people.

But these people doing the chasing had faces covered in blood and their they looked almost inhumanly crazed.

She looked back up at Kent and gaped. "What the hell is this? Who is that angry mob?"

"Prentiss, this isn't just an angry mob," he said seriously. "It seems that some animal activists broke into a secret research facility that was doing experiments on chimpanzees. The problem with them? They were infected with a virus. And now that the virus has been released, it's spreading through the city like wild fire. The army is coming in, but not fast enough."

Her face drained of blood. "Are you saying that we've got an epidemic?"

Kent nodded. "Yes," he said. "And right now the only thing we can do is survive. That and pray."

She grabbed her gear and nodded. She had to warn Derek and Penelope. "How much do we actually know about it?" she asked when she slung her.

"Well, it's not air born, it's transferred through the blood or saliva. Get bitten, you get the virus. People keep succumbing to it. We've been advised to attempt to get out of the country. I suggest you get your friends and run."

"Already done," she said hastily as she hurried towards the door.

XXXXX

Derek sat on the couch with an arm around Penelope. He wished she would see how he felt about her. She was the love of his life, but he apparently failed miserably at expressing his feelings for her. And when he looked at her, it looked like she might respond, but then she never did.

Penelope confused the hell out of him when it came to the two of them possibly getting together.

A commercial break for Downtown Abbey struck and Penelope sat up, stretching in the process. She grinned and said, "Well, I'm going to use the little girls' room. I'll be back as soon as I'm done and hopefully we'll be watching the episode again!"

Unable to keep a grin of his own off his face, he leaned his head back against the cushions and blew out an exaggerated sigh. "You're lucky you're gorgeous, because if you weren't, I don't think I'd sit through all this...drama." He jerked his thumb in the direction of the TV.

She giggled and started for the bathroom, swishing her hips as she went.

He leaned his head back against the cushions, turning the volume on the TV to mute. There had to be a way for him to tell Penelope how he loved her tactfully. Maybe Emily could shed some light on the topic, give him some advice on the topic. Because at this point, he was completely clueless on how things should be going. Never in his life had he been in love with another human beings. Now that he was, the woman he had fallen in love with was making things...hazy. Did she love him, did she not love him? Those and more were the questions he had in mind.

Rubbing his face, he rose from the couch to get another cup of coffee. He glanced at his watch. Prentiss should have returned by now. His brow furrowed as he took a sip of his freshly poured coffee.

"Derek? Where'd you go?"

He looked up at the sound of Penelope's voice. "In the kit -" he started to call out before the sound of the door being thrust open interrupted him.

"Guys!" Emily said swiftly, coming in and locking the door behind her. Both Penelope and Derek rushed to meet her.

"Em?" Penelope asked with concern. "What's wrong?"

Emily went to the window that overlooked the street below and looked around nervously. She was very clearly rattled by something. Her hair was frazzled, her cheeks were red, and she was breathing heavily, as if she'd been running to get back.

Derek and Penelope exchanged a worried glance. "What's going on, Prentiss?" he asked. "You look freaked."

She looked back towards them and nodded. "We should all be freaked," she said in shaky tone. "Guys, we have to get out of here. Now!" She looked out the window again and the blood drained from her face.

Penelope rushed to her side and looked out the window as well. The blood drained from her face and she looked like she might be sick. Derek joined them, but he wasn't paying attention to whatever they were looking out at; he was concerned about Penelope.

"Oh my God!" Penelope cried, her nails digging into Derek's arm so hard that they left trenches. "Em, did that guy - did he just, just..."

Finally, Derek looked outside and saw what both his friends were staring at. Down below on the street, slightly difficult to see was a group of three people moving at lightning speed.

And on the ground at their feet was another human being, a puddle of blood surrounding them.

Derek and Penelope turned to face Emily's grim face. "What the hell is going on, Prentiss?" he growled.

Her face pale, she shook her head. "You guys will hardly believe this," she breathed. "I'll explain while we pack.