a day as someone else

As you're pulled back into the limo, someone slips a blindfold over your eyes. You're about to call for help when you feel a knife press up against your throat. You gasp as the cold metal touches against the soft skin of your neck.

"Listen here Sandra," you hear a voice whisper. The voice has a unpleasant, almost grating tone to it. "If you even THINK of doing anything funny, you'll be dead before you can lift your pinky finger."

You're scared now. Whoever this guy is, he means business. But you're puzzled, why did he call you 'Sandra' and why does he want her? Is this all some big mistake on his part?

"Carl, tie her up," the voice says and you feel a thick, meaty hand grab onto your arm.

What do you do?