Sneak Peak of "Could I be You?"

Here's a sneak peak of my next story, "Could I be You" I am not yet finished with it and it is UNEDITED, meaning it is FULL of mistakes. I'm excited because it is my first attempt at science fiction. Enjoy. As always credit goes to Matchbox Twenty for writing the song.

Could I Be You
based on the song of the same title.

He was staring at her again. She could feel it. Beth looked over her shoulder and sure enough the man was there, eyes boring a hole into her. He was a short man, not that intimidating. He could be young or he could be old, Beth never really looked. All she knew was that he would stare at her, with his hat pulled low, like he knew she wasn’t one of them.
She took off down the street, careful to keep her pace at a slow, stately walk, instead of the sprint that she wanted to do. Every once in a while she would peek back to see if he was following. He was, as always. She darted into an alley way and immediately started to run. She knew he wouldn’t follow this far; he never did.
She was out of breath by the time she arrived at Tara’s. Tara lived in an abandoned warehouse, in the Old district. There was no telling on how long it would be before Tara and Beth would be discovered. Every day, they lived in fear of being found. Other pockets of humans had been found and taken. They were never seen again.
The human race wasn’t ready for such a quick take over. The Operation was over quickly and only some people still survived, if you call hiding and scrounging surviving. Beth didn’t know where they came from, she didn’t think anybody did. One day the world was in perfect order and the next the human race was gone. At first nobody noticed. They acted human, went to work, ate, had families, everything. Except for one small detail; they had no emotion. Their eyes, devoid of any feeling, gave them away. People panicked at the thought of an alien invasion, and in that instance lost any ground they may have had. For with panic come mistakes and humans made some bad ones. The invaders called themselves Din and they took over quickly and efficiently.
The humans that were left learned that the best way to survive was to behave like the Din, no emotion whatsoever was allowed. And it worked, as long as they could keep the anger, fear, and sadness, out of their eyes. Beth’s sister, Tara, couldn’t do it. She was too emotional, and it fell to Beth to make sure that the Din never found out they were still free. Beth had perfected the blank look, locking her fear and anger inside a room deep inside her mind. She would go out walk the streets of what used to be Nashville and steal what they needed to live.
A couple of weeks ago the man had started to stare and follow her. She didn’t tell Tara, because that might be the final straw to send Tara over the edge. She already was in a fragile state. She spent all her time in her room, pouring over pictures of disappeared family and friends, arranging and rearranging them. Beth would do anything to protect her.
Beth still didn’t know what to make of the man. He never approached her. Just stared, and when she moved he followed until the alleyway. Every day they went through the same routine. It didn’t matter if she tried a different part of the city; he was always there. Beth sighed and walked into the warehouse.