It had been 5 years since the apocalypse first started. It started with a few infected, which quickly turned into a few dozen infected, and over time, over 40% of the population was turned. Rudy, Alejandro, and the rest of Los Vaqueros had got separated, and over those 5 years, had been spending it trying to find Alejandro. The only person he could have left.
And you were only 8 when it all started. Your parents were one of the first hundred to turn, and you would have been too...but you weren't. You had been bitten, but nothing happened. You were the only immune survivor due to a specific genetic mutation. Ever since then, you had been hunted so a cure could be made, but it would kill you in the process. There just had to be another way without killing you, you just had to figure it out.
Now, you were hiding in a library, barricading yourself out of fear from the people who were hunting you down and the infected. You put boards on the windows and doors and locked everything you could. Or, at least you thought you did. You were reading as you ate your rations, having enough to last a few more days. Maybe a week if you lessened what you ate.
click
That was the sound of a gun reloading, and not your own. You quickly hid behind a bookshelf, reloading your own pistol. Once you had your gun readied, you peeked over the shelves, seeing a man in military gear pointing his gun straight at you.