You're devastated, knowing your sister was kidnapped. You are shaking not able to stop your tears from falling from your cheeks. Suddenly, your phone rings. You immediately pick it up and see an unknown number.   "Hello?" You nervously say. You heard a whimper. "Help me!" You were shocked that it was your sister.   "Please don't hurt her!" You begged, and the caller chuckled. "if you want her in one piece, then meet me in this location; I'm waiting, but don't make me wait too much." He hangs up.