City of the Dead

You freeze up. A woman looks at you through a window in the door and lets you in. "The door's been rigged to electrify anyone who touches it.

"Some theather this is!" you think.

"Anyway, my name is Tina," the woman says, "I've been holed up in here with five others since early this morning."

"What's with all the undead?" you ask.

"We've been watching the TV in the employee's room," Tina says, "apparently, a chemical spill at a research facility released deadly toxins into the air. The reporter says this has been causing all who inhale it to die, and become one of those things."

"Then why am I not dead?"

"The reporter said," Tina continues, "the toxins apparently have no effect on anybody with an A blood-type."

You think. Most Americans have an O blood-type, which explains the mass deaths, and you have an A blood-type. It all makes sense.

"C'mon, I'll show you the others," Tina says. You're suspicious. What if she's some kind of intelligent zombie?